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All questions of Nervous Coordination in Animals for JAMB Exam
Sense of smell is by :a) olfactory lobeb) cerebellumc) cerebrumd) hypothalamusCorrect answer is option 'A'. Can you explain this answer?
|
Deeksha answered |
Option c) olfactory lobe is responsible for sense of smell
Which part of the brain is affected first in a drunk person :[Bihar-2004]- a)Cerebrum
- b)Olfactory lobe
- c)Cerebellum
- d)Medulla oblongata
Correct answer is option 'C'. Can you explain this answer?
Which part of the brain is affected first in a drunk person :
[Bihar-2004]
a)
Cerebrum
b)
Olfactory lobe
c)
Cerebellum
d)
Medulla oblongata
|
Swati Verma answered |
When a person gets addicted to alcohol, many serious health problems can occur due to consumption of alcohol. The first part of brain to be affected first is Cerebellum. The will power and self control of the person gets reduced. Control over emotions and moral sense also gets reduced. Loss of muscle coordination also occurs as cerebellum is affected. As a result, speech becomes incoherent. Inflammation of axons also occur which causes neuritis.
Voluntary activities of body are controlled by :-- a)Diencephalon
- b)Cerebrum
- c)Crura cerebri
- d)Cerebellum
Correct answer is option 'B'. Can you explain this answer?
Voluntary activities of body are controlled by :-
a)
Diencephalon
b)
Cerebrum
c)
Crura cerebri
d)
Cerebellum
|
Mohit Rajpoot answered |
The cerebrum is the largest part of the forebrain. It is responsible for the integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body. It has specific functional lobe which is controls speech, generates several responses to different stimulus.
So, the correct answer is option B.
So, the correct answer is option B.
Area of most active vision in eye where sharp image is formed is called - a)Blind spot
- b)Yellow spot
- c)Lens
- d)Pupil
Correct answer is option 'B'. Can you explain this answer?
Area of most active vision in eye where sharp image is formed is called
a)
Blind spot
b)
Yellow spot
c)
Lens
d)
Pupil
|
Neha Joshi answered |
The yellow spot or macula is an oval yellow spot near the centre of the retina of the human eye. It has a size of 1.5 millimeters. It is specialized for seeing things with highest clearness or visual acuity. It is the area of best vision, where maximum amount of rod cells and cone cells are present.
In mammals, the brain centre, which regulates body temperature is situated in :
[UP-CPMT 2001]
a)hypothalamusb)Olfactory lobec)Cerebellumd)Medulla oblongataCorrect answer is option 'A'. Can you explain this answer?
|
|
Soumya Yadav answered |
The hypothalamus have temperature receptor cells which detect changes in the temperature of the blood flowing through the brain. If the temperature is above or below 37 degree Celsius the hypothalamus sends electrical nerve impulse to the effector which is mainly present in the skin.
If cerebellum of man gets damaged, his movement become :-- a)Shaky & speech become defective
- b)Unbalanced, walk uncontrolled, defective speech & intention tremor
- c)Jerky & defective speech
- d)Jerky & walked uncontrolled
Correct answer is option 'B'. Can you explain this answer?
If cerebellum of man gets damaged, his movement become :-
a)
Shaky & speech become defective
b)
Unbalanced, walk uncontrolled, defective speech & intention tremor
c)
Jerky & defective speech
d)
Jerky & walked uncontrolled
|
|
Pramod Bohara answered |
Cerebellum also called a small brain
coordinates muscular movements and maintains our body posture apart from this it is a main centre for skeletal muscles activities
So yes obviously the correct answer will be (B)
coordinates muscular movements and maintains our body posture apart from this it is a main centre for skeletal muscles activities
So yes obviously the correct answer will be (B)
Which part of the brain regulates the body temperature, hunger and water balance :-- a)Hypothalamus
- b)Infundibulum
- c)Medulla oblongata
- d)Pons veroli
Correct answer is option 'A'. Can you explain this answer?
Which part of the brain regulates the body temperature, hunger and water balance :-
a)
Hypothalamus
b)
Infundibulum
c)
Medulla oblongata
d)
Pons veroli
|
Ciel Knowledge answered |
The part of the brain that regulates body temperature, hunger, and water balance is the Hypothalamus. Here's why:
- Hypothalamus:
- Regulates body temperature by triggering mechanisms like sweating or shivering.
- Controls hunger by responding to hunger hormones and signals.
- Manages water balance by regulating thirst and controlling the release of antidiuretic hormone (ADH).
In summary, the hypothalamus plays a crucial role in maintaining internal balance (homeostasis) within the body, ensuring optimal functioning.
- Hypothalamus:
- Regulates body temperature by triggering mechanisms like sweating or shivering.
- Controls hunger by responding to hunger hormones and signals.
- Manages water balance by regulating thirst and controlling the release of antidiuretic hormone (ADH).
In summary, the hypothalamus plays a crucial role in maintaining internal balance (homeostasis) within the body, ensuring optimal functioning.
Pigmented layer in eye is called- a)Cornea
- b)Sclerotic
- c)Retina
- d)All
Correct answer is option 'C'. Can you explain this answer?
Pigmented layer in eye is called
a)
Cornea
b)
Sclerotic
c)
Retina
d)
All
|
Krishna Iyer answered |
The retina makes up the inner layer and occupies only the posterior two-third of the eye. The retina consists of several layers of cells, including the rods and cones, the sensory cells, that respond to light. The tips of the rods and cones are embedded in a pigmented layer of cells on the back of the retina. The pigment helps prevent light from scattering in the back of the eye.
In man nictitating membrane is- a)Absent
- b)Vestigeal
- c)Non-functional
- d)Functional
Correct answer is option 'B'. Can you explain this answer?
In man nictitating membrane is
a)
Absent
b)
Vestigeal
c)
Non-functional
d)
Functional
|
|
T.ttttt answered |
Eye. The plica semilunaris is a small fold of tissue on the inside corner of the eye. It is the vestigial remnant of the nictitating membrane, an organ that is fully functional in some other species of mammals. Its associated muscles are also vestigial
Most of the involuntary action are controlled by :-- a)Medulla oblongata
- b)Cerebrum
- c)Cerebellum
- d)Diencephalon
Correct answer is option 'C'. Can you explain this answer?
Most of the involuntary action are controlled by :-
a)
Medulla oblongata
b)
Cerebrum
c)
Cerebellum
d)
Diencephalon
|
Lavanya Menon answered |
Involuntary actions are those action that controlled by medulla oblongata which is a part of the autonomous nervous system where as voluntary actions are controlled by the cerebellum. The medulla oblongata directly controls heartbeat, blood pressure, breathing and digestion. It is located in the hindbrain, anterior to the cerebellum. It is a cone-shaped and contains the cardiac, respiratory, vomiting and vasomotor centers. Hence, the correct answer is option C.
The aperture controlling the light entering in eye is called - a)Iris
- b)Pupil
- c)Blind spot
- d)Sclerotic layer
Correct answer is option 'B'. Can you explain this answer?
The aperture controlling the light entering in eye is called
a)
Iris
b)
Pupil
c)
Blind spot
d)
Sclerotic layer
|
|
Shalini... answered |
The pupil is a hole or aperture in the middle of the iris. Iris is the colored part of the eye that controls the amount of light entering the eye by adjusting the size of the pupil. The point of exit of optic nerve from eye forms a “blind spot” in the retina. The sclera is the white and opaque outer layer of the eyeball.
Lens and retina of vertebrate eye develop from - a)Mesoderm
- b)Ectoderm
- c) Endoderm
- d) Partly from ectoderm and partly from endoderm
Correct answer is option 'B'. Can you explain this answer?
Lens and retina of vertebrate eye develop from
a)
Mesoderm
b)
Ectoderm
c)
Endoderm
d)
Partly from ectoderm and partly from endoderm
|
|
Abdul Saleem4367 answered |
According to ncert ectoderm hi answer hoga Bhai...
Tear is a - a)Secretory fluid
- b)Excretory fluid
- c) Pure fluid
- d)Lymphatic fluid
Correct answer is option 'A'. Can you explain this answer?
Tear is a
a)
Secretory fluid
b)
Excretory fluid
c)
Pure fluid
d)
Lymphatic fluid
|
|
Saumya Sarkar answered |
Tear is a Secretory Fluid
Explanation:
Tear is a fluid that is produced by the lacrimal gland, which is located in the upper outer portion of the eye socket. Tear is a secretory fluid that is made up of several components, including:
1. Water - Tears are mostly made up of water, which helps to keep the eye moist and lubricated.
2. Salt - Tears contain salt, which helps to keep the eye clean by killing bacteria and other harmful organisms.
3. Enzymes - Tears contain enzymes that help to break down bacteria and other harmful substances.
4. Proteins - Tears contain proteins that help to protect the eye and keep it healthy.
5. Mucus - Tears contain mucus, which helps to keep the eye's surface smooth and free of debris.
Functions of Tears:
Tears serve several important functions in the eye, including:
1. Lubrication - Tears help to keep the eye moist and lubricated, which helps to prevent dryness and irritation.
2. Protection - Tears help to protect the eye from bacteria, viruses, and other harmful substances.
3. Cleansing - Tears help to cleanse the eye by flushing out debris, dirt, and other particles.
4. Emotional expression - Tears can be produced in response to emotions such as sadness, joy, or frustration.
Conclusion:
In conclusion, tear is a secretory fluid that is produced by the lacrimal gland in the eye. It is made up of water, salt, enzymes, proteins, and mucus, and serves several important functions in the eye, including lubrication, protection, cleansing, and emotional expression.
Explanation:
Tear is a fluid that is produced by the lacrimal gland, which is located in the upper outer portion of the eye socket. Tear is a secretory fluid that is made up of several components, including:
1. Water - Tears are mostly made up of water, which helps to keep the eye moist and lubricated.
2. Salt - Tears contain salt, which helps to keep the eye clean by killing bacteria and other harmful organisms.
3. Enzymes - Tears contain enzymes that help to break down bacteria and other harmful substances.
4. Proteins - Tears contain proteins that help to protect the eye and keep it healthy.
5. Mucus - Tears contain mucus, which helps to keep the eye's surface smooth and free of debris.
Functions of Tears:
Tears serve several important functions in the eye, including:
1. Lubrication - Tears help to keep the eye moist and lubricated, which helps to prevent dryness and irritation.
2. Protection - Tears help to protect the eye from bacteria, viruses, and other harmful substances.
3. Cleansing - Tears help to cleanse the eye by flushing out debris, dirt, and other particles.
4. Emotional expression - Tears can be produced in response to emotions such as sadness, joy, or frustration.
Conclusion:
In conclusion, tear is a secretory fluid that is produced by the lacrimal gland in the eye. It is made up of water, salt, enzymes, proteins, and mucus, and serves several important functions in the eye, including lubrication, protection, cleansing, and emotional expression.
Nissl's granules are found in :[UTTARANCHAL-2005]- a)liver cells
- b)nerve cells
- c)kidney
- d)heart
Correct answer is option 'B'. Can you explain this answer?
Nissl's granules are found in :
[UTTARANCHAL-2005]
a)
liver cells
b)
nerve cells
c)
kidney
d)
heart
|
Adit Raj answered |
Option B these are site proteins synthesis.. Rough endoplasmic reticulum(RER) are attached with ribosomesFound in nerve cells.
The common defect of eye which develops in old age is - a)Glaucoma
- b)Astigmatism
- c)Presbyopia
- d)Myopia
Correct answer is option 'C'. Can you explain this answer?
The common defect of eye which develops in old age is
a)
Glaucoma
b)
Astigmatism
c)
Presbyopia
d)
Myopia
|
Raghav Bansal answered |
Presbyopia occurs due to decrease in the power of accommodation of the eye usually because of ageing which causes gradual weakening of the ciliary muscles and diminishes flexibility of the eye lens.
Nissl’s granules are made up of: [Bihar-2004]
- a)RER bodies
- b)DNA
- c)carbohydrate
- d)Smooth Endoplasmic Reticulum
Correct answer is option 'A'. Can you explain this answer?
Nissl’s granules are made up of: [Bihar-2004]
a)
RER bodies
b)
DNA
c)
carbohydrate
d)
Smooth Endoplasmic Reticulum
|
Anurag Yadav answered |
Nissl granules are made of ribosomes & endoplasmic reticulum found in Cyton and dendron & it'd primary function is protein synthesis.
Brain stem is the support system of brain and is the collective name for :
- a)Medulla, Pons,and Midbrain
- b)Hypothalamus, Diencephalon, Cerebellum, and Pons
- c)Cerebrum, Mesencephalon, Diencephalon, and Medulla
- d)Prosencephalon, Mesencephalon, Pons, and Medulla
Correct answer is option 'A'. Can you explain this answer?
Brain stem is the support system of brain and is the collective name for :
a)
Medulla, Pons,and Midbrain
b)
Hypothalamus, Diencephalon, Cerebellum, and Pons
c)
Cerebrum, Mesencephalon, Diencephalon, and Medulla
d)
Prosencephalon, Mesencephalon, Pons, and Medulla
|
|
Pritam Choudhary answered |
Brainstem: The Support System of Brain
The brainstem is the lower part of the brain that connects the brain to the spinal cord. It is responsible for regulating important functions such as breathing, heart rate, blood pressure, and consciousness. The brainstem consists of three main parts, which are:
Medulla
The medulla oblongata, or simply the medulla, is the lowest part of the brainstem. It controls involuntary functions such as breathing, heartbeat, and digestion. The medulla also contains reflex centers for coughing, sneezing, and vomiting.
Pons
The pons is the middle part of the brainstem, located above the medulla and below the midbrain. It is involved in the regulation of sleep, respiration, and posture. The pons also helps to relay messages between different parts of the brain.
Midbrain
The midbrain, also known as the mesencephalon, is the uppermost part of the brainstem. It is involved in the regulation of vision, hearing, and movement. The midbrain contains several important structures, including the substantia nigra, which produces dopamine and is involved in the control of movement.
Conclusion
In conclusion, the brainstem is the support system of the brain and is responsible for regulating vital functions. It consists of three main parts, which are the medulla, pons, and midbrain. The medulla controls involuntary functions such as breathing and heartbeat, the pons is involved in the regulation of sleep and posture, and the midbrain is responsible for vision, hearing, and movement.
The brainstem is the lower part of the brain that connects the brain to the spinal cord. It is responsible for regulating important functions such as breathing, heart rate, blood pressure, and consciousness. The brainstem consists of three main parts, which are:
Medulla
The medulla oblongata, or simply the medulla, is the lowest part of the brainstem. It controls involuntary functions such as breathing, heartbeat, and digestion. The medulla also contains reflex centers for coughing, sneezing, and vomiting.
Pons
The pons is the middle part of the brainstem, located above the medulla and below the midbrain. It is involved in the regulation of sleep, respiration, and posture. The pons also helps to relay messages between different parts of the brain.
Midbrain
The midbrain, also known as the mesencephalon, is the uppermost part of the brainstem. It is involved in the regulation of vision, hearing, and movement. The midbrain contains several important structures, including the substantia nigra, which produces dopamine and is involved in the control of movement.
Conclusion
In conclusion, the brainstem is the support system of the brain and is responsible for regulating vital functions. It consists of three main parts, which are the medulla, pons, and midbrain. The medulla controls involuntary functions such as breathing and heartbeat, the pons is involved in the regulation of sleep and posture, and the midbrain is responsible for vision, hearing, and movement.
To correct myopia vision one should use - a)Convex lens
- b)Concave lens
- c)Plane lens
- d)None
Correct answer is option 'B'. Can you explain this answer?
To correct myopia vision one should use
a)
Convex lens
b)
Concave lens
c)
Plane lens
d)
None
|
|
Kuldeep Kuldeep answered |
In order to correct Myopia vision, Concave lens should be used. Because, a person with Myopia can see the nearer objects clearly but can't see distant objects clearly due to the image formation occurs in front of Retina. So, we can see the nearer objects clearly. To do the correction for the eye defect Myopia, we should use Concave lens of suitable focal length. So, Option b is correct friend.
Aperture of an eye can be changed by - a)Aquous humor
- b)Vitreous humor
- c)Ciliary muscles
- d)Iris
Correct answer is option 'D'. Can you explain this answer?
Aperture of an eye can be changed by
a)
Aquous humor
b)
Vitreous humor
c)
Ciliary muscles
d)
Iris
|
Ritika Pandey answered |
Iris Is a dark muscular diaphgram that controls the size of the pupil..
For good reflex actions we require intact- a)spinal cord
- b)medulla oblongata
- c)hypothalamus
- d)cerebellum
Correct answer is option 'A'. Can you explain this answer?
For good reflex actions we require intact
a)
spinal cord
b)
medulla oblongata
c)
hypothalamus
d)
cerebellum
|
Priya Menon answered |
The afferent neruron receive signal from a sensory organ and transmits the impulse the via a dorsal nerve root into CNS (at level of spinal cord).
''Telescopic vision'' found in- a)Amphibians
- b)Mammals
- c)Birds
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
''Telescopic vision'' found in
a)
Amphibians
b)
Mammals
c)
Birds
d)
None of these
|
|
Ayaan Madhukar answered |
Birds hai..bro..
E.g. :-- Hawks, Eagles...
E.g. :-- Hawks, Eagles...
Hyalocytes cells occurs in- a)Aqueous humor
- b)Vitreous humor
- c)Both
- d)None of them
Correct answer is option 'B'. Can you explain this answer?
Hyalocytes cells occurs in
a)
Aqueous humor
b)
Vitreous humor
c)
Both
d)
None of them
|
Yash Saha answered |
Hyalocytes, also known as vitreous cells, are cells of the vitreous body, which is the clear gel that fills the space between the lens and the retina of the eye. Hyalocytes occur in the peripheral part of the vitreous body, and may produce hyaluronic acid, collagen, fibrils, and hyaluronan.
Which one of the following diseases in man belongs to the same category as haemophilia - a)Hyper matropia
- b)Rabies
- c)Nigh blindness
- d)Colour blindness
Correct answer is option 'D'. Can you explain this answer?
Which one of the following diseases in man belongs to the same category as haemophilia
a)
Hyper matropia
b)
Rabies
c)
Nigh blindness
d)
Colour blindness
|
Harshitha Reddy answered |
Introduction:
Haemophilia is a genetic disorder that affects blood clotting in humans. It is inherited on the X chromosome and primarily affects males. There are several other genetic disorders that belong to the same category as haemophilia. Let's explore the options given and determine which one of them is related to haemophilia.
Explanation:
a) Hypermetropia:
Hypermetropia, also known as farsightedness, is a refractive error of the eye where distant objects are seen more clearly than nearby objects. It is caused by the shape of the eye, particularly the cornea or lens, which prevents light from focusing directly on the retina. Hypermetropia is not related to haemophilia and is not a genetic disorder.
b) Rabies:
Rabies is a viral disease that affects the central nervous system of mammals, including humans. It is primarily transmitted through the bite of an infected animal, most commonly dogs. Rabies is not related to haemophilia and is not a genetic disorder.
c) Night blindness:
Night blindness is a condition in which an individual experiences difficulty seeing in low-light conditions or at night. It is often caused by a deficiency of vitamin A or a genetic disorder called retinitis pigmentosa. Night blindness is not related to haemophilia and is not a genetic disorder.
d) Colour blindness:
Colour blindness, also known as color vision deficiency, is a genetic disorder that affects an individual's ability to perceive certain colors. It is primarily caused by an inherited lack or malfunction of certain cone cells in the retina. Colour blindness is related to haemophilia as both are genetic disorders.
Conclusion:
Among the given options, colour blindness is the disease that belongs to the same category as haemophilia. Both are genetic disorders that can be inherited and are caused by mutations in specific genes. While haemophilia affects blood clotting, colour blindness affects an individual's ability to perceive certain colors.
Haemophilia is a genetic disorder that affects blood clotting in humans. It is inherited on the X chromosome and primarily affects males. There are several other genetic disorders that belong to the same category as haemophilia. Let's explore the options given and determine which one of them is related to haemophilia.
Explanation:
a) Hypermetropia:
Hypermetropia, also known as farsightedness, is a refractive error of the eye where distant objects are seen more clearly than nearby objects. It is caused by the shape of the eye, particularly the cornea or lens, which prevents light from focusing directly on the retina. Hypermetropia is not related to haemophilia and is not a genetic disorder.
b) Rabies:
Rabies is a viral disease that affects the central nervous system of mammals, including humans. It is primarily transmitted through the bite of an infected animal, most commonly dogs. Rabies is not related to haemophilia and is not a genetic disorder.
c) Night blindness:
Night blindness is a condition in which an individual experiences difficulty seeing in low-light conditions or at night. It is often caused by a deficiency of vitamin A or a genetic disorder called retinitis pigmentosa. Night blindness is not related to haemophilia and is not a genetic disorder.
d) Colour blindness:
Colour blindness, also known as color vision deficiency, is a genetic disorder that affects an individual's ability to perceive certain colors. It is primarily caused by an inherited lack or malfunction of certain cone cells in the retina. Colour blindness is related to haemophilia as both are genetic disorders.
Conclusion:
Among the given options, colour blindness is the disease that belongs to the same category as haemophilia. Both are genetic disorders that can be inherited and are caused by mutations in specific genes. While haemophilia affects blood clotting, colour blindness affects an individual's ability to perceive certain colors.
In old age farsightedness is a defect of eye in man, in which - a)Eye ball becomes short
- b)Eye ball becomes elongated
- c)Lens become more concave
- d)Lens become more spherical
Correct answer is option 'C'. Can you explain this answer?
In old age farsightedness is a defect of eye in man, in which
a)
Eye ball becomes short
b)
Eye ball becomes elongated
c)
Lens become more concave
d)
Lens become more spherical
|
|
Riya Banerjee answered |
Presbyopia is caused by an age related process. It occurs due to a gradual thickening and loss of flexibility of the natural lens inside the eye. These age related changes occur within the proteins in the lens, making the lens harder and less elastic over time. Age related changes also take place in the muscle fibers surrounding the lens. Changes in the lens curvature progressively cause diminished ability to focus on near objects.
So, the correct answer is option C.
So, the correct answer is option C.
Drinking of alcohol affects mostly:-- a)Cerebrum
- b)Cerebellum
- c)Medulla oblongata
- d)Dien cephalon
Correct answer is option 'B'. Can you explain this answer?
Drinking of alcohol affects mostly:-
a)
Cerebrum
b)
Cerebellum
c)
Medulla oblongata
d)
Dien cephalon
|
Ved Patidar answered |
In first affects cerebrum and more effective on cerebellum.
Which of the following is responsible for control of reflex actions :-- a)Motor nerves
- b)Sensory nerves
- c)Central nervous system
- d)Sympathetic nervous system
Correct answer is option 'C'. Can you explain this answer?
Which of the following is responsible for control of reflex actions :-
a)
Motor nerves
b)
Sensory nerves
c)
Central nervous system
d)
Sympathetic nervous system
|
|
Rahul Negi answered |
A reflex arc is a neural pathway, that controls an action reflex. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord (central nervous system). This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of sending signals through the brain.
Photosensitive pigment is - a)Similar in all eyes
- b)Different in all eyes
- c)Similar in all vertebrate eyes
- d) Red in all eyes
Correct answer is option 'C'. Can you explain this answer?
Photosensitive pigment is
a)
Similar in all eyes
b)
Different in all eyes
c)
Similar in all vertebrate eyes
d)
Red in all eyes
|
|
Smruti Sucharita answered |
photosensitive pigments r RODS n CONES ..
They r similar in all vertebrates
Parkinson's disease is associated with :[JHARKHAND-2002]- a)midbrain
- b)thalamus
- c)hypothalamus
- d)cerebrum
Correct answer is option 'D'. Can you explain this answer?
Parkinson's disease is associated with :
[JHARKHAND-2002]
a)
midbrain
b)
thalamus
c)
hypothalamus
d)
cerebrum
|
Santhoshi Talabattula answered |
Parkinsons disease is a disesace of cerebrum of CNS which includes autonomic disfunction, neuro psychiatric problems
A small region on the retina of the eye which contains only cones is called- a)Area centralis
- b)Fovea centralis
- c)Blind spot
- d)Ora serrata
Correct answer is option 'B'. Can you explain this answer?
A small region on the retina of the eye which contains only cones is called
a)
Area centralis
b)
Fovea centralis
c)
Blind spot
d)
Ora serrata
|
|
Abhishek Goyal answered |
Explanation:
The small region on the retina of the eye that contains only cones is called the fovea centralis. It is located in the center of the macula, which is a small area at the back of the eye responsible for central vision.
The fovea centralis is a specialized area of the retina that is responsible for high visual acuity, color vision, and detailed central vision. It contains a high concentration of cone cells, which are photoreceptor cells responsible for detecting color and fine details in the visual field. Cones are highly sensitive to light and are responsible for our ability to see in bright light conditions.
Function and Features of Fovea Centralis:
The fovea centralis has several unique features and functions that make it essential for clear and detailed vision:
1. High Cone Density: The fovea centralis has the highest concentration of cone cells compared to any other part of the retina. This high density of cones allows for increased visual acuity and color discrimination.
2. Central Vision: The fovea centralis is responsible for central vision, which is the ability to see objects directly in front of us and focus on fine details. It provides the sharpest vision and is essential for tasks such as reading, driving, and recognizing faces.
3. No Rod Cells: Unlike other parts of the retina, the fovea centralis lacks rod cells, which are responsible for peripheral and low-light vision. This absence of rod cells allows the fovea centralis to have a higher density of cones and enhances its ability to perceive color and fine details.
4. Concentric Arrangement: The cone cells in the fovea centralis are arranged in a tightly packed manner, with each cone having its own direct connection to a ganglion cell. This arrangement ensures that the visual information collected by the cones is transmitted accurately to the brain, leading to precise vision.
In summary, the fovea centralis is a specialized region on the retina that contains a high density of cone cells, allowing for sharp central vision, color perception, and detailed visual acuity. It plays a crucial role in our ability to see fine details and is essential for tasks that require precise vision.
The small region on the retina of the eye that contains only cones is called the fovea centralis. It is located in the center of the macula, which is a small area at the back of the eye responsible for central vision.
The fovea centralis is a specialized area of the retina that is responsible for high visual acuity, color vision, and detailed central vision. It contains a high concentration of cone cells, which are photoreceptor cells responsible for detecting color and fine details in the visual field. Cones are highly sensitive to light and are responsible for our ability to see in bright light conditions.
Function and Features of Fovea Centralis:
The fovea centralis has several unique features and functions that make it essential for clear and detailed vision:
1. High Cone Density: The fovea centralis has the highest concentration of cone cells compared to any other part of the retina. This high density of cones allows for increased visual acuity and color discrimination.
2. Central Vision: The fovea centralis is responsible for central vision, which is the ability to see objects directly in front of us and focus on fine details. It provides the sharpest vision and is essential for tasks such as reading, driving, and recognizing faces.
3. No Rod Cells: Unlike other parts of the retina, the fovea centralis lacks rod cells, which are responsible for peripheral and low-light vision. This absence of rod cells allows the fovea centralis to have a higher density of cones and enhances its ability to perceive color and fine details.
4. Concentric Arrangement: The cone cells in the fovea centralis are arranged in a tightly packed manner, with each cone having its own direct connection to a ganglion cell. This arrangement ensures that the visual information collected by the cones is transmitted accurately to the brain, leading to precise vision.
In summary, the fovea centralis is a specialized region on the retina that contains a high density of cone cells, allowing for sharp central vision, color perception, and detailed visual acuity. It plays a crucial role in our ability to see fine details and is essential for tasks that require precise vision.
What is the correct path of a reflex arc?- a)Sensory stimulus → Dendrite → Axon
- b)Motor nerves → Acetylcholine → Adjustor neuron
- c)Efferent nerves → Connector nerves → Motor nerves
- d)Afferent nerves → Efferent nerves → Connector nerves
Correct answer is option 'A'. Can you explain this answer?
What is the correct path of a reflex arc?
a)
Sensory stimulus → Dendrite → Axon
b)
Motor nerves → Acetylcholine → Adjustor neuron
c)
Efferent nerves → Connector nerves → Motor nerves
d)
Afferent nerves → Efferent nerves → Connector nerves
|
Mira Joshi answered |
The correct pathway of reflex arc is : Sensory stimulus → Dentrite of sensory neuron → Axon of sensory neuron → CNS → Dendrite of motor neuron → Axon of motor neuron → Effector organ
Injury localised to the hypothalamus would most likely disrupt- a)short term memory
- b)coordination during locomotion
- c)executive function, such as decision making
- d)regulation of body temperature
Correct answer is option 'D'. Can you explain this answer?
Injury localised to the hypothalamus would most likely disrupt
a)
short term memory
b)
coordination during locomotion
c)
executive function, such as decision making
d)
regulation of body temperature
|
Aman Sharma answered |
The primary function of the hypothalamus is homoeostasis, which is to maintain the body's normal temperature and body's status. So, if there is an injury to the hypothalamus, the thermoregulatory centre is disturbed resulting in a deregulation of body temperature. So, the correct answer is option D.
Stereoscopic vision is found in- a)All mammals
- b)All vertebrates
- c)Primates
- d)Frog
Correct answer is option 'C'. Can you explain this answer?
Stereoscopic vision is found in
a)
All mammals
b)
All vertebrates
c)
Primates
d)
Frog
|
Stuti Kumar answered |
Ans.
The term stereoscopic vision refers to the human ability to view with both eyes in similar, but slightly different ways. This allows humans to judge distance, which develops their ability to have true depth perception.
Stereoscopic vision is particularly well developed in mammals with foveas, frontal vision, hemidecussatting visual pathways, and vergence eye movements, such as felines and primates.
Stereopsis is an aspect of "normal" healthy vision. Here's how it works. First, both eyes must be accurately aimed at the same target (that's binocular vision, but it's not yet stereoscopic vision!) Then, because the two eyes are located in different positions, each takes in a unique view from its own perspective.
What is meant by coordination?- a)Only two organs interact
- b)Two or more organs interact
- c)Only two organs systems interact
- d)Only three organs interact
Correct answer is option 'B'. Can you explain this answer?
What is meant by coordination?
a)
Only two organs interact
b)
Two or more organs interact
c)
Only two organs systems interact
d)
Only three organs interact
|
Ambition Institute answered |
Coordination is the process through which two or more organs interact and complement the functions of one another. For example, the functions of muscles, lungs, heart, blood vessels, kidney, and other organs are coordinated while performing physical exercises.
Topic in NCERT: NEURAL CONTROL AND COORDINATIONLine in NCERT: "Coordination is the process through which two or more organs interact and complement the functions of one another."
Night blindness is caused due to - a)Hypermatropia
- b)Myopia
- c)Defective cornea
- d)Deficiency of rhodopsin in rods
Correct answer is option 'D'. Can you explain this answer?
Night blindness is caused due to
a)
Hypermatropia
b)
Myopia
c)
Defective cornea
d)
Deficiency of rhodopsin in rods
|
Pooja Goyal answered |
Because rhodopsin is a protein.... rods are responsible for vision at low light (scotopic vision).... and rhodopsin makes it possible.. as it is very sensitive towards light and make us things visible...
Retina of the vertebrates eye consists of - a) Neurons and neuroglia
- b)Rods, cones, neurons and neuroglia
- c)Rods, cones and neuroglia
- d)Rods and cones
Correct answer is option 'B'. Can you explain this answer?
Retina of the vertebrates eye consists of
a)
Neurons and neuroglia
b)
Rods, cones, neurons and neuroglia
c)
Rods, cones and neuroglia
d)
Rods and cones
|
|
Ameya Mehta answered |
The correct answer is option B: Rods, cones, neurons, and neuroglia.
Retina is a thin layer of tissue located at the back of the eyeball. It plays a crucial role in the process of vision by converting light into electrical signals that can be interpreted by the brain. The retina consists of several different cell types, including rods, cones, neurons, and neuroglia.
1. Rods: Rods are photoreceptor cells that are responsible for vision in dim light conditions. They are highly sensitive to light and are mainly responsible for black and white vision. Rods are more abundant in the periphery of the retina.
2. Cones: Cones are another type of photoreceptor cells that are responsible for color vision and visual acuity. They are less sensitive to light but can detect different wavelengths of light, allowing us to see different colors. Cones are mainly concentrated in the central part of the retina called the fovea.
3. Neurons: The retina contains several layers of neurons that process and transmit visual information. These neurons include bipolar cells, ganglion cells, and amacrine cells. Bipolar cells receive signals from photoreceptor cells (rods and cones) and transmit them to ganglion cells. Ganglion cells are the output neurons of the retina that send visual information to the brain via the optic nerve. Amacrine cells play a role in modulating and refining the visual signals transmitted through the retina.
4. Neuroglia: Neuroglia, also known as glial cells, are non-neuronal cells that provide support and protection to the neurons in the retina. They help maintain the structural integrity of the retina and provide nutrients to the neurons. Neuroglia also play a role in regulating the chemical environment of the retina and modulating neuronal activity.
In summary, the retina of the vertebrate eye consists of rods, cones, neurons, and neuroglia. These different cell types work together to convert light into electrical signals, process visual information, and transmit it to the brain for interpretation.
Retina is a thin layer of tissue located at the back of the eyeball. It plays a crucial role in the process of vision by converting light into electrical signals that can be interpreted by the brain. The retina consists of several different cell types, including rods, cones, neurons, and neuroglia.
1. Rods: Rods are photoreceptor cells that are responsible for vision in dim light conditions. They are highly sensitive to light and are mainly responsible for black and white vision. Rods are more abundant in the periphery of the retina.
2. Cones: Cones are another type of photoreceptor cells that are responsible for color vision and visual acuity. They are less sensitive to light but can detect different wavelengths of light, allowing us to see different colors. Cones are mainly concentrated in the central part of the retina called the fovea.
3. Neurons: The retina contains several layers of neurons that process and transmit visual information. These neurons include bipolar cells, ganglion cells, and amacrine cells. Bipolar cells receive signals from photoreceptor cells (rods and cones) and transmit them to ganglion cells. Ganglion cells are the output neurons of the retina that send visual information to the brain via the optic nerve. Amacrine cells play a role in modulating and refining the visual signals transmitted through the retina.
4. Neuroglia: Neuroglia, also known as glial cells, are non-neuronal cells that provide support and protection to the neurons in the retina. They help maintain the structural integrity of the retina and provide nutrients to the neurons. Neuroglia also play a role in regulating the chemical environment of the retina and modulating neuronal activity.
In summary, the retina of the vertebrate eye consists of rods, cones, neurons, and neuroglia. These different cell types work together to convert light into electrical signals, process visual information, and transmit it to the brain for interpretation.
Nissl's granules are absent in :[UP-CPMT 2001]- a)axon
- b)cyton
- c)dendron
- d)Schwann cells
Correct answer is option 'A'. Can you explain this answer?
Nissl's granules are absent in :
[UP-CPMT 2001]
a)
axon
b)
cyton
c)
dendron
d)
Schwann cells
|
Pulicharla Subbareddy answered |
Except in axon in remaining have nissl granules
Perception of various colour is possible in- a)All vertebrates
- b)Most of the mammals
- c)Man only
- d)Birds only
Correct answer is option 'B'. Can you explain this answer?
Perception of various colour is possible in
a)
All vertebrates
b)
Most of the mammals
c)
Man only
d)
Birds only
|
|
Vartika Shukla answered |
A typical bird eye will respond to wavelengths from about 300 to 700 nm. Humans cannot perceive UV light directly because the lens of the eye blocks most light in the wavelength range of 300 - 400 nm. Another big difference between the tetrachromacy vision of humans and birds lies in the retina. The fovea, which is the area of the retina responsible for the precise vision of the details and where there is a big concentration of cones, form a lateral strip rather than a central area. Added to the fact that some birds can have two or even more fovea, birds have a lot more cones than humans and this consequently can visualise colours better than humans. Birds have photopigments, that are sensitive to four or five peak wavelengths. Because of this fact, they are much more sensitive to colours than humans.
Somaesthetic or post central area is responsible for :[UTTARANCHAL-2005]- a)initiation of motor impulses for voluntary muscles
- b)initiation of motor impulses for involuntary muscles
- c)perception of pain, touch and temperature
- d)co-ordination of speech
Correct answer is option 'C'. Can you explain this answer?
Somaesthetic or post central area is responsible for :
[UTTARANCHAL-2005]
a)
initiation of motor impulses for voluntary muscles
b)
initiation of motor impulses for involuntary muscles
c)
perception of pain, touch and temperature
d)
co-ordination of speech
|
|
Dhivya Pooja answered |
The somatosensory cortex is a part of your brain that receives and processes sensory information from the entire body. Other names of somatosensory cortex include somesthetic area and somatic sensory area.This part of the brain is essential for receiving sensory information from the body and processing it to initiate important movements that are required to deal a particular situation. It receives sensations of touch, pain, and vibration from the entire body.
Binocular vision found in- a)Man
- b)Monkey
- c)Apes
- d)All the above
Correct answer is option 'D'. Can you explain this answer?
Binocular vision found in
a)
Man
b)
Monkey
c)
Apes
d)
All the above
|
Navya Datta answered |
Binocular vision is the ability to perceive depth and three-dimensional structure of an object by using both eyes together as a pair. This vision is critical for humans and many animals for survival, hunting, and finding food.
Binocular vision is found in various species, including humans, monkeys, and apes. The correct answer is option D, which includes all of them.
Let us understand more about binocular vision in different species:
1. Humans:
Humans have forward-facing eyes that are placed at an angle to each other, which allows binocular vision. The brain processes the images from both eyes to give a single, three-dimensional image. This allows humans to perceive depth and distance accurately, which is crucial for activities such as driving, sports, and many others.
2. Monkeys:
Monkeys also have forward-facing eyes that are close together, which allows them to have excellent binocular vision. This helps them to navigate through the forest, jump from branch to branch, and catch prey.
3. Apes:
Apes, such as gorillas, chimpanzees, and orangutans, also have forward-facing eyes like humans and monkeys. They have excellent binocular vision, which helps them to swing through trees and navigate through the dense forest. Apes also have a greater depth perception than humans, as they have a wider visual field.
In conclusion, binocular vision is found in various species, including humans, monkeys, and apes. It allows these animals to perceive depth and distance accurately, which is critical for survival and many other activities.
Binocular vision is found in various species, including humans, monkeys, and apes. The correct answer is option D, which includes all of them.
Let us understand more about binocular vision in different species:
1. Humans:
Humans have forward-facing eyes that are placed at an angle to each other, which allows binocular vision. The brain processes the images from both eyes to give a single, three-dimensional image. This allows humans to perceive depth and distance accurately, which is crucial for activities such as driving, sports, and many others.
2. Monkeys:
Monkeys also have forward-facing eyes that are close together, which allows them to have excellent binocular vision. This helps them to navigate through the forest, jump from branch to branch, and catch prey.
3. Apes:
Apes, such as gorillas, chimpanzees, and orangutans, also have forward-facing eyes like humans and monkeys. They have excellent binocular vision, which helps them to swing through trees and navigate through the dense forest. Apes also have a greater depth perception than humans, as they have a wider visual field.
In conclusion, binocular vision is found in various species, including humans, monkeys, and apes. It allows these animals to perceive depth and distance accurately, which is critical for survival and many other activities.
All are the functions of M.O., except :-- a)Regulate respiration
- b)Regulate heart beats
- c)Vomiting reflex
- d)Body balance
Correct answer is option 'D'. Can you explain this answer?
All are the functions of M.O., except :-
a)
Regulate respiration
b)
Regulate heart beats
c)
Vomiting reflex
d)
Body balance
|
|
Sapna Patel answered |
Medulla oblongata is responsible to regulate respiration, heart beat rates, vomiting reflex while body balance and movement is controlled by cerebellum.
Which of the following statements is correct about a resting neuron?- a)The permeability of the plasma membrane for Na+ ions is greater than its permeability for K+ ions.
- b)The permeability of the plasma membrane for K+ ions is greater than its permeability for Na+ ions.
- c)Sodium-potassium pump actively pumps K+ ions to extracellular fluid.
- d)The axoplasm has high concentration of Na+ ions.
Correct answer is option 'B'. Can you explain this answer?
Which of the following statements is correct about a resting neuron?
a)
The permeability of the plasma membrane for Na+ ions is greater than its permeability for K+ ions.
b)
The permeability of the plasma membrane for K+ ions is greater than its permeability for Na+ ions.
c)
Sodium-potassium pump actively pumps K+ ions to extracellular fluid.
d)
The axoplasm has high concentration of Na+ ions.
|
Divyansh Saha answered |
Permeability of the plasma membrane for K ions is greater than its permeability for Na ions.
Explanation:
The resting membrane potential of a neuron refers to its electrical charge when it is not transmitting any signals or impulses. During this resting state, the concentration of ions inside and outside the neuron is maintained by the sodium-potassium pump, which actively transports sodium (Na+) ions out of the cell and potassium (K+) ions into the cell.
Differential Permeability:
The plasma membrane of a neuron is differentially permeable, meaning that it allows certain ions to pass through more easily than others. This permeability is determined by the presence of ion channels, which are proteins embedded in the membrane that allow specific ions to move across.
Resting Neuron:
In a resting neuron, the permeability of the plasma membrane for K ions is greater than its permeability for Na ions. This means that potassium ions are more likely to move across the membrane compared to sodium ions.
Reasoning:
1. The sodium-potassium pump actively transports three sodium ions out of the cell for every two potassium ions it transports into the cell. This process helps maintain the concentration gradient of these ions.
2. Due to the differential permeability of the membrane, potassium ions can move more freely across the membrane compared to sodium ions.
3. As potassium ions move out of the cell, they establish a negative charge inside the neuron, creating a potential difference across the membrane.
4. This potential difference is known as the resting membrane potential and is typically around -70 millivolts in neurons.
5. The higher permeability of the membrane to potassium ions compared to sodium ions contributes to the establishment and maintenance of the resting membrane potential.
Conclusion:
In summary, the correct statement is that the permeability of the plasma membrane for K ions is greater than its permeability for Na ions in a resting neuron. This differential permeability allows potassium ions to move more freely across the membrane, contributing to the establishment of the resting membrane potential.
Explanation:
The resting membrane potential of a neuron refers to its electrical charge when it is not transmitting any signals or impulses. During this resting state, the concentration of ions inside and outside the neuron is maintained by the sodium-potassium pump, which actively transports sodium (Na+) ions out of the cell and potassium (K+) ions into the cell.
Differential Permeability:
The plasma membrane of a neuron is differentially permeable, meaning that it allows certain ions to pass through more easily than others. This permeability is determined by the presence of ion channels, which are proteins embedded in the membrane that allow specific ions to move across.
Resting Neuron:
In a resting neuron, the permeability of the plasma membrane for K ions is greater than its permeability for Na ions. This means that potassium ions are more likely to move across the membrane compared to sodium ions.
Reasoning:
1. The sodium-potassium pump actively transports three sodium ions out of the cell for every two potassium ions it transports into the cell. This process helps maintain the concentration gradient of these ions.
2. Due to the differential permeability of the membrane, potassium ions can move more freely across the membrane compared to sodium ions.
3. As potassium ions move out of the cell, they establish a negative charge inside the neuron, creating a potential difference across the membrane.
4. This potential difference is known as the resting membrane potential and is typically around -70 millivolts in neurons.
5. The higher permeability of the membrane to potassium ions compared to sodium ions contributes to the establishment and maintenance of the resting membrane potential.
Conclusion:
In summary, the correct statement is that the permeability of the plasma membrane for K ions is greater than its permeability for Na ions in a resting neuron. This differential permeability allows potassium ions to move more freely across the membrane, contributing to the establishment of the resting membrane potential.
Convex lens is used to correct - a)Hypermatropia
- b)Myopia
- c)Cataract
- d)Glaucoma
Correct answer is option 'A'. Can you explain this answer?
Convex lens is used to correct
a)
Hypermatropia
b)
Myopia
c)
Cataract
d)
Glaucoma
|
Nishtha Chopra answered |
Convex lens is used to correct Hypermetropia
Hypermetropia, also known as farsightedness or hyperopia, is a common refractive error of the eye. It occurs when the eyeball is too short or the cornea is not curved enough, causing the light entering the eye to focus behind the retina instead of directly on it. This results in blurred vision, especially when looking at nearby objects.
To correct hypermetropia, a convex lens is used. A convex lens is thicker at the center and thinner at the edges. It is also known as a converging lens because it converges or brings the light rays together. Here's how a convex lens helps in correcting hypermetropia:
1. Converging Light Rays:
- When a convex lens is placed in front of the eye, it converges the incoming light rays towards the center.
- This helps in bending the light rays so that they converge and focus properly on the retina, forming a clear image.
2. Increasing Focal Length:
- The focal length of a convex lens is the distance between the lens and the point where the light rays converge.
- By using a convex lens with an appropriate focal length, the focal point can be shifted forward to coincide with the retina, allowing for clear vision.
3. Correcting Refractive Error:
- Hypermetropia occurs when the eyeball is too short or the cornea is not curved enough, causing the image to be focused behind the retina.
- A convex lens compensates for this by converging the light rays before they enter the eye, ensuring that the image is focused correctly on the retina.
4. Near Vision Improvement:
- Hypermetropia often causes difficulty in seeing nearby objects clearly.
- By using a convex lens, the light rays from nearby objects are bent in such a way that they converge on the retina, allowing for improved near vision.
In summary, a convex lens is used to correct hypermetropia by converging the light rays and bringing them to a focus on the retina. This helps in compensating for the refractive error and improving both distance and near vision.
Hypermetropia, also known as farsightedness or hyperopia, is a common refractive error of the eye. It occurs when the eyeball is too short or the cornea is not curved enough, causing the light entering the eye to focus behind the retina instead of directly on it. This results in blurred vision, especially when looking at nearby objects.
To correct hypermetropia, a convex lens is used. A convex lens is thicker at the center and thinner at the edges. It is also known as a converging lens because it converges or brings the light rays together. Here's how a convex lens helps in correcting hypermetropia:
1. Converging Light Rays:
- When a convex lens is placed in front of the eye, it converges the incoming light rays towards the center.
- This helps in bending the light rays so that they converge and focus properly on the retina, forming a clear image.
2. Increasing Focal Length:
- The focal length of a convex lens is the distance between the lens and the point where the light rays converge.
- By using a convex lens with an appropriate focal length, the focal point can be shifted forward to coincide with the retina, allowing for clear vision.
3. Correcting Refractive Error:
- Hypermetropia occurs when the eyeball is too short or the cornea is not curved enough, causing the image to be focused behind the retina.
- A convex lens compensates for this by converging the light rays before they enter the eye, ensuring that the image is focused correctly on the retina.
4. Near Vision Improvement:
- Hypermetropia often causes difficulty in seeing nearby objects clearly.
- By using a convex lens, the light rays from nearby objects are bent in such a way that they converge on the retina, allowing for improved near vision.
In summary, a convex lens is used to correct hypermetropia by converging the light rays and bringing them to a focus on the retina. This helps in compensating for the refractive error and improving both distance and near vision.
Cerebral hemisphere is the centre of :-[RPMT–2003]- a)taste
- b)smell
- c)balance
- d)thinking
Correct answer is option 'D'. Can you explain this answer?
Cerebral hemisphere is the centre of :-
[RPMT–2003]
a)
taste
b)
smell
c)
balance
d)
thinking
|
Smruti Sucharita answered |
Cerebral hemisphere has two parts right hemisphere n Left hemisphere..
left cerebral hemisphere control the right part of body ..n helps in solving logical tasks
right cerebral hemisphere control the left side of the body n perform creativity tasks...
so overall it helps in thinking
process of body...
Main function of cerebellum is :[UTTARANCHAL-2005]- a)Balancing
- b)Sight
- c)Hearing
- d)Memory
Correct answer is option 'A'. Can you explain this answer?
Main function of cerebellum is :
[UTTARANCHAL-2005]
a)
Balancing
b)
Sight
c)
Hearing
d)
Memory
|
|
Pinki Chinni answered |
CEREBELLUM CONTROLS VOLUNTARY MOVEMENTS.
SO IT HELPS IN BALANCING OF THE BODY.
SO IT HELPS IN BALANCING OF THE BODY.
During night when the intensity of light is low, it is detected by - a)Rods
- b)Cones
- c)Both
- d)Crystalline lens
Correct answer is option 'A'. Can you explain this answer?
During night when the intensity of light is low, it is detected by
a)
Rods
b)
Cones
c)
Both
d)
Crystalline lens
|
|
Megha Das answered |
Explanation:
The human eye has two types of photoreceptor cells, rods, and cones. Rods are responsible for detecting light in low-light conditions, while cones are responsible for detecting light in bright-light conditions and for color vision. Therefore, during the night when the intensity of light is low, it is detected by rods.
Function of Rods:
Rods are highly sensitive to light and can detect even a single photon of light. They are responsible for our ability to see in dim light, such as moonlight or starlight. Rods do not distinguish between colors and are responsible for our perception of black and white or shades of gray.
Location of Rods:
Rods are located in the outer regions of the retina, away from the fovea, which is the central part of the retina responsible for sharp vision and color perception.
Structure of Rods:
Rods contain a light-sensitive pigment called rhodopsin, which consists of a protein called opsin and a molecule called retinal. When light enters the eye and strikes the retinal, it undergoes a chemical change that activates the rod cell, which then sends a signal to the brain that is interpreted as visual information.
Conclusion:
Therefore, during low light conditions, rods play a vital role in detecting light and providing us with visual information. They are responsible for our ability to see in dim light and perceive shades of gray.
The human eye has two types of photoreceptor cells, rods, and cones. Rods are responsible for detecting light in low-light conditions, while cones are responsible for detecting light in bright-light conditions and for color vision. Therefore, during the night when the intensity of light is low, it is detected by rods.
Function of Rods:
Rods are highly sensitive to light and can detect even a single photon of light. They are responsible for our ability to see in dim light, such as moonlight or starlight. Rods do not distinguish between colors and are responsible for our perception of black and white or shades of gray.
Location of Rods:
Rods are located in the outer regions of the retina, away from the fovea, which is the central part of the retina responsible for sharp vision and color perception.
Structure of Rods:
Rods contain a light-sensitive pigment called rhodopsin, which consists of a protein called opsin and a molecule called retinal. When light enters the eye and strikes the retinal, it undergoes a chemical change that activates the rod cell, which then sends a signal to the brain that is interpreted as visual information.
Conclusion:
Therefore, during low light conditions, rods play a vital role in detecting light and providing us with visual information. They are responsible for our ability to see in dim light and perceive shades of gray.
Meiboniam gland are associated with- a)Eyes
- b)Ears
- c)Reproductive organ
- d)Skin
Correct answer is option 'A'. Can you explain this answer?
Meiboniam gland are associated with
a)
Eyes
b)
Ears
c)
Reproductive organ
d)
Skin
|
Lohit Matani answered |
The Meibomian gland (often written with a small "m" and also called tarsal gland) is a holocrine type of exocrine gland, at the rim of the eyelid inside the tarsal plate, responsible for the supply of meibum, an oily substance that prevents evaporation of the eye's tear film.
Which of the following is purely motor cranial nerve?[UP-CPMT 2002]- a)Oflactory
- b)Optic
- c)Abducens
- d)Vagus
Correct answer is option 'C'. Can you explain this answer?
Which of the following is purely motor cranial nerve?
[UP-CPMT 2002]
a)
Oflactory
b)
Optic
c)
Abducens
d)
Vagus
|
|
Vignesh answered |
Motor cranial nerves - Oculomotor , Trochlear , Abducens , Accessory , Hypoglossal
Which of the following statements is incorrect regarding electrical synapses?- a)Transmission of signals is faster than chemical synapses
- b)Pre and postsynaptic membranes are in very close proximity
- c) Electrical synapse can flow directly from one neuron to another
- d)They are very common in our system
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements is incorrect regarding electrical synapses?
a)
Transmission of signals is faster than chemical synapses
b)
Pre and postsynaptic membranes are in very close proximity
c)
Electrical synapse can flow directly from one neuron to another
d)
They are very common in our system
|
|
Mohit Rajpoot answered |
Electrical synapses are very rare in our system. At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity. Impulse transmission across an electrical synapse is always faster than chemical synapse.
Topic in NCERT: Transmission of ImpulsesLine in NCERT: "Electrical synapses are rare in our system."
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