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All questions of Neural Control and Coordination for NEET Exam
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).
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
During the propagation of a nerve impulse, the action potential results from the movement of- a)K+ ions from intracellular fluid to extracellular fluid
- b)Na+ ions from extracellular fluid to intracellular fluid
- c)K+ ions from extracellular fluid to intracellular fluid
- d)Na+ ions from intracellular fluid to extracellular fluid
Correct answer is option 'B'. Can you explain this answer?
During the propagation of a nerve impulse, the action potential results from the movement of
a)
K+ ions from intracellular fluid to extracellular fluid
b)
Na+ ions from extracellular fluid to intracellular fluid
c)
K+ ions from extracellular fluid to intracellular fluid
d)
Na+ ions from intracellular fluid to extracellular fluid
|
Vivek Patel answered |
Action potential is a change in electrical potential that occurs across a plasma membrane during the passage of a nerve impulse. During this period, there is a localized and translent switch in electric potential across the membrane from -70 mV to +45 mV. It is due to the fact that the sodium channels open and the potassium channels remain closed. As a result, sodium channels permit the influx of Na+ by diffusion from extracellular fluid to intracellular fluid.
Assertion: The somatic neural system regulates involuntary functions of the body.
Reason: The somatic neural system is divided into the sympathetic and parasympathetic systems.- a)Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
- b)Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
- c)Assertion is correct, but Reason is incorrect.
- d)Both Assertion and Reason are incorrect
Correct answer is option 'D'. Can you explain this answer?
Assertion: The somatic neural system regulates involuntary functions of the body.
Reason: The somatic neural system is divided into the sympathetic and parasympathetic systems.
Reason: The somatic neural system is divided into the sympathetic and parasympathetic systems.
a)
Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
b)
Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
c)
Assertion is correct, but Reason is incorrect.
d)
Both Assertion and Reason are incorrect
|
Ciel Knowledge answered |
Both Assertion and Reason are incorrect. The autonomic neural system regulates involuntary body functions, and autonomic neural system is divided into the sympathetic and parasympathetic systems, which perform different roles in controlling these functions.
Read the following statements and mark the correct option which is suitable. - The neural system of animals is composed of specialized cells called neurons.
- The central neural system (CNS) consists of the brain and spinal cord.
- The peripheral nervous system (PNS) is involved in transmitting impulses only from the CNS to muscles.
- The autonomic neural system controls voluntary actions like skeletal muscle movement.
- a)Statements 1, 2, and 4 are correct.
- b)Statements 1, 2, and 3 are correct.
- c) Statements 1 and 2 are correct, while 3 and 4 are incorrect.
- d)All statements are correct.
Correct answer is option 'C'. Can you explain this answer?
Read the following statements and mark the correct option which is suitable.
- The neural system of animals is composed of specialized cells called neurons.
- The central neural system (CNS) consists of the brain and spinal cord.
- The peripheral nervous system (PNS) is involved in transmitting impulses only from the CNS to muscles.
- The autonomic neural system controls voluntary actions like skeletal muscle movement.
a)
Statements 1, 2, and 4 are correct.
b)
Statements 1, 2, and 3 are correct.
c)
Statements 1 and 2 are correct, while 3 and 4 are incorrect.
d)
All statements are correct.
|
Jhanvi Sen answered |
Understanding the Neural System of Animals
The statements presented about the neural system of animals can be analyzed for accuracy:
Statement 1: Neurons
- Correct.
- The neural system is indeed composed of specialized cells called neurons, which are responsible for transmitting signals throughout the body.
Statement 2: Central Neural System (CNS)
- Correct.
- The CNS consists of the brain and spinal cord, functioning as the main control center for processing information.
Statement 3: Peripheral Nervous System (PNS)
- Incorrect.
- The PNS is responsible for transmitting impulses both from the CNS to muscles and from sensory organs to the CNS. It includes both afferent (sensory) and efferent (motor) pathways.
Statement 4: Autonomic Neural System
- Incorrect.
- The autonomic nervous system regulates involuntary actions, such as heart rate and digestion, not voluntary actions like skeletal muscle movement, which is controlled by the somatic nervous system.
Conclusion
- Therefore, the correct option is c): Statements 1 and 2 are correct, while 3 and 4 are incorrect. This highlights the importance of understanding the roles of different components of the nervous system in animal physiology.
The statements presented about the neural system of animals can be analyzed for accuracy:
Statement 1: Neurons
- Correct.
- The neural system is indeed composed of specialized cells called neurons, which are responsible for transmitting signals throughout the body.
Statement 2: Central Neural System (CNS)
- Correct.
- The CNS consists of the brain and spinal cord, functioning as the main control center for processing information.
Statement 3: Peripheral Nervous System (PNS)
- Incorrect.
- The PNS is responsible for transmitting impulses both from the CNS to muscles and from sensory organs to the CNS. It includes both afferent (sensory) and efferent (motor) pathways.
Statement 4: Autonomic Neural System
- Incorrect.
- The autonomic nervous system regulates involuntary actions, such as heart rate and digestion, not voluntary actions like skeletal muscle movement, which is controlled by the somatic nervous system.
Conclusion
- Therefore, the correct option is c): Statements 1 and 2 are correct, while 3 and 4 are incorrect. This highlights the importance of understanding the roles of different components of the nervous system in animal physiology.
In the human neural system, the coordination between different organ systems is essential for maintaining homeostasis during physical activities.
Which of the following statements best explains the roles of the central nervous system (CNS) and the peripheral nervous system (PNS) during intense physical exercise?- a)The PNS coordinates all involuntary actions during physical exercise, including the regulation of skeletal muscles, heart rate, and respiration, while the CNS only provides feedback through the sympathetic and parasympathetic systems without direct control of the muscles
- b)The CNS exclusively controls the skeletal muscles through the somatic neural system, while the PNS regulates the automatic functions of the heart and lungs through the autonomic system, without requiring feedback to the CNS.
- c)The CNS coordinates the entire response to exercise by transmitting efferent signals to skeletal muscles through the somatic system and to involuntary organs through the autonomic system, while the PNS transmits feedback only from the muscles, excluding heart and lung responses.
- d) The CNS processes sensory information from the muscles and organs, and sends efferent impulses via the PNS to regulate heart rate and muscle contraction, while the PNS carries afferent impulses from the lungs and heart to the CNS for feedback.
Correct answer is option 'D'. Can you explain this answer?
In the human neural system, the coordination between different organ systems is essential for maintaining homeostasis during physical activities.
Which of the following statements best explains the roles of the central nervous system (CNS) and the peripheral nervous system (PNS) during intense physical exercise?
Which of the following statements best explains the roles of the central nervous system (CNS) and the peripheral nervous system (PNS) during intense physical exercise?
a)
The PNS coordinates all involuntary actions during physical exercise, including the regulation of skeletal muscles, heart rate, and respiration, while the CNS only provides feedback through the sympathetic and parasympathetic systems without direct control of the muscles
b)
The CNS exclusively controls the skeletal muscles through the somatic neural system, while the PNS regulates the automatic functions of the heart and lungs through the autonomic system, without requiring feedback to the CNS.
c)
The CNS coordinates the entire response to exercise by transmitting efferent signals to skeletal muscles through the somatic system and to involuntary organs through the autonomic system, while the PNS transmits feedback only from the muscles, excluding heart and lung responses.
d)
The CNS processes sensory information from the muscles and organs, and sends efferent impulses via the PNS to regulate heart rate and muscle contraction, while the PNS carries afferent impulses from the lungs and heart to the CNS for feedback.
|
Mohit Rajpoot answered |
During intense physical exercise, the CNS processes sensory information from muscles and organs, sending efferent impulses through the PNS to regulate actions like muscle contraction and heart rate. Simultaneously, the PNS sends afferent impulses back to the CNS from the lungs and heart, providing feedback, which is crucial for coordinating the response to the increased demand for oxygen and energy.
Topic in NCERT: PERIPHERAL NERVOUS SYSTEM
Line in NCERT: "The afferent nerve fibres transmit impulses from tissues/organs to the CNS and the efferent fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs."
Topic in NCERT: PERIPHERAL NERVOUS SYSTEM
Line in NCERT: "The afferent nerve fibres transmit impulses from tissues/organs to the CNS and the efferent fibres transmit regulatory impulses from the CNS to the concerned peripheral tissues/organs."
Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.- a)(i) and (ii)
- b)(ii) and (iii)
- c)(iii) and (iv)
- d)(i) and (iv)
Correct answer is option 'C'. Can you explain this answer?
Read the given statements and select the correct ones.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.
(i) Autonomic neural system transmits impulses from the CNS to the voluntary organs and striated muscles of the body.
(ii) Unmyelinated nerve fibres do not have Schwann cells which form the myelin sheath.
(iii) Axonal membrane of a neuron while not conducting any impulse is comparatively more permeable to potassium ions (K+) than to sodium ions (Na+).
(iv) A synapse is formed by the membranes of a presynaptic neuron and a post synaptic neuron.
a)
(i) and (ii)
b)
(ii) and (iii)
c)
(iii) and (iv)
d)
(i) and (iv)
|
Anjali Sharma answered |
Autonomic neural system controls and coordinates such organs which are under involuntary control and unstriated muscles of the body. Unmyelinated nerve fibres have Schwann cells which do not form myelin sheath.
Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon
(iv) Electrica synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.- a)(ii), (iv) and (v)
- b)(i) and (iii)
- c)(iv) only
- d)(i), (v) and (vi)
Correct answer is option 'C'. Can you explain this answer?
Which of the following statements is/are incorrect about the electrical synapse?
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon
(iv) Electrica synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.
(i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity.
(ii) Electrical current can flow directly from one neuron into the other across the synapses
(iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon
(iv) Electrica synapses pass electrical signal between cells with the use of Ach.
(v) Electrical synapses are fast.
(vi) Electrical synapses are rare in our system.
a)
(ii), (iv) and (v)
b)
(i) and (iii)
c)
(iv) only
d)
(i), (v) and (vi)
|
|
Soumya Kulkarni answered |
Incorrect Statements about Electrical Synapse:
Membranes Proximity:
- Statement (i) is incorrect because at electrical synapses, the membranes of pre and post synaptic neurons are in direct contact, not just in close proximity.
Direct Current Flow:
- Statement (ii) is correct as electrical current can flow directly from one neuron into the other across the synapses.
Impulse Transmission:
- Statement (iii) is incorrect as the transmission of an impulse across electrical synapses is not similar to impulse conduction along a single axon. It is faster and more direct.
Use of Ach:
- Statement (iv) is incorrect because electrical synapses do not pass electrical signals between cells using acetylcholine (Ach) or any other neurotransmitter.
Speed of Transmission:
- Statement (v) is correct as electrical synapses are known for their fast transmission of signals between neurons.
Prevalence of Electrical Synapses:
- Statement (vi) is incorrect as electrical synapses are actually quite common in the nervous system, especially in regions where rapid signaling is essential.
Therefore, the incorrect statements about electrical synapses are (i), (iii), and (iv), making option (c) the correct choice.
Membranes Proximity:
- Statement (i) is incorrect because at electrical synapses, the membranes of pre and post synaptic neurons are in direct contact, not just in close proximity.
Direct Current Flow:
- Statement (ii) is correct as electrical current can flow directly from one neuron into the other across the synapses.
Impulse Transmission:
- Statement (iii) is incorrect as the transmission of an impulse across electrical synapses is not similar to impulse conduction along a single axon. It is faster and more direct.
Use of Ach:
- Statement (iv) is incorrect because electrical synapses do not pass electrical signals between cells using acetylcholine (Ach) or any other neurotransmitter.
Speed of Transmission:
- Statement (v) is correct as electrical synapses are known for their fast transmission of signals between neurons.
Prevalence of Electrical Synapses:
- Statement (vi) is incorrect as electrical synapses are actually quite common in the nervous system, especially in regions where rapid signaling is essential.
Therefore, the incorrect statements about electrical synapses are (i), (iii), and (iv), making option (c) the correct choice.
Which of the following correctly describes the role of the central nervous system (CNS)?- a) It is responsible for transmitting impulses from the organs to the brain.
- b) It processes information and controls bodily functions.
- c) It includes all the nerves outside the brain and spinal cord.
- d) It consists only of the spinal cord.
Correct answer is option 'B'. Can you explain this answer?
Which of the following correctly describes the role of the central nervous system (CNS)?
a)
It is responsible for transmitting impulses from the organs to the brain.
b)
It processes information and controls bodily functions.
c)
It includes all the nerves outside the brain and spinal cord.
d)
It consists only of the spinal cord.
|
Ambition Institute answered |
The central nervous system (CNS) is primarily responsible for processing information and regulating bodily functions. It encompasses the brain and spinal cord, serving as the main control center for all activities in the body. The CNS interprets sensory information received from the peripheral nervous system (PNS) and coordinates responses. An interesting fact is that the brain alone contains approximately 86 billion neurons, which play a crucial role in cognitive functions, movement, and sensory perception.
Which of the following is the example of conditioned reflex?- a)Hand withdraws when pierced with a needle
- b)Eye closes, when anything enters into it
- c)During digestion food goes forward in alimentary canal
- d)Trained dog salivates when you ring a bell
Correct answer is option 'D'. Can you explain this answer?
Which of the following is the example of conditioned reflex?
a)
Hand withdraws when pierced with a needle
b)
Eye closes, when anything enters into it
c)
During digestion food goes forward in alimentary canal
d)
Trained dog salivates when you ring a bell
|
Hansa Sharma answered |
Trained dog salivates when you ring a bell is the example of conditioned reflex. Conditioned reflexes are acquired reflexes, dependent on past experience, training and learining.
Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secrete adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.- a)Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
- b)Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
- c)Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrect
- d)Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect
Correct answer is option 'D'. Can you explain this answer?
Read the given statements and select the correct option.
(i) Synaptic cleft of neurons secrete adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.
(i) Synaptic cleft of neurons secrete adrenaline.
(ii) Myelinated nerve fibres are enveloped with Schwann cells, which from a myelin sheath around the axon.
(iii) Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
(iv) Spinal and cranial nerves are made of non-melinated nerve fibres.
a)
Statements (i) and (ii) are correct but statements (iii) and (iv) are incorrect
b)
Statements (i), (ii) and (iii) are correct but statement (iv) is incorrect
c)
Statement (iii) and (iv) are correct but statement (i) and (ii) are incorrect
d)
Statement (ii) and (iii) are correct but statements (i) and (iv) are incorrect
|
|
Preeti Iyer answered |
Synaptic vesicles of the synaptic knob secrete neurotransmitter (e.g., adrenaline). Spinal nerves and cranial nerves are myelinated nerves.
Which of the following is not a reflex action?- a)salivation
- b)sweating
- c)withdrawal of hand when pinched by needle
- d)blinking of eyes
Correct answer is option 'B'. Can you explain this answer?
Which of the following is not a reflex action?
a)
salivation
b)
sweating
c)
withdrawal of hand when pinched by needle
d)
blinking of eyes
|
Dev Patel answered |
An automatic (involunatary) neuromuscular action elicited by defined stimulus is called reflex action. Sweating is not reflex action. It is primarily a means of temperature regulation.
Sodium-potassium pump transports- a)Na+ and K+ out of the neuron
- b)Na+ and K+ into the neuron
- c)Na+ into the neuron and K+ out of the neuron
- d)K+ into the neuron and Na+ out of the neuron
Correct answer is option 'D'. Can you explain this answer?
Sodium-potassium pump transports
a)
Na+ and K+ out of the neuron
b)
Na+ and K+ into the neuron
c)
Na+ into the neuron and K+ out of the neuron
d)
K+ into the neuron and Na+ out of the neuron
|
Gaurav Kumar answered |
Each Na+ -K+ pump expels three Na+ ions for every two K+ ions imported.
Assertion: The functions of the organs in our body must be coordinated to maintain homeostasis.
Reason: Coordination is the process where two or more organs interact and complement each other’s functions.- a)Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
- b)Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
- c)Assertion is correct, but Reason is incorrect.
- d)Assertion is incorrect, but Reason is correct.
Correct answer is option 'A'. Can you explain this answer?
Assertion: The functions of the organs in our body must be coordinated to maintain homeostasis.
Reason: Coordination is the process where two or more organs interact and complement each other’s functions.
Reason: Coordination is the process where two or more organs interact and complement each other’s functions.
a)
Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
b)
Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
c)
Assertion is correct, but Reason is incorrect.
d)
Assertion is incorrect, but Reason is correct.
|
Nidhi Chauhan answered |
Understanding Homeostasis
Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes. This involves the regulation of various physiological parameters such as temperature, pH, and electrolyte balance.
Assertion Explanation
- The assertion states that the functions of the organs in our body must be coordinated to maintain homeostasis.
- This is correct because organs do not function in isolation. For example, the respiratory system works with the circulatory system to ensure that oxygen is delivered to tissues and carbon dioxide is removed.
Reason Explanation
- The reason provided indicates that coordination is the interaction and complementing functions of two or more organs.
- This is also a correct statement as organs often work together to perform complex tasks that no single organ could achieve alone. For example, the kidneys and the endocrine system work together to regulate blood pressure and fluid balance.
Linking Assertion and Reason
- The reason directly explains the assertion by highlighting how organs complement each other to maintain homeostasis.
- For instance, during exercise, the heart rate increases (cardiovascular system), while the lungs facilitate increased oxygen intake (respiratory system), showcasing their coordinated efforts to maintain stable conditions in the body.
Conclusion
- Since both the assertion and the reason are true, and the reason correctly explains the assertion, the correct answer is option 'A': Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
Homeostasis is the process by which living organisms maintain a stable internal environment despite external changes. This involves the regulation of various physiological parameters such as temperature, pH, and electrolyte balance.
Assertion Explanation
- The assertion states that the functions of the organs in our body must be coordinated to maintain homeostasis.
- This is correct because organs do not function in isolation. For example, the respiratory system works with the circulatory system to ensure that oxygen is delivered to tissues and carbon dioxide is removed.
Reason Explanation
- The reason provided indicates that coordination is the interaction and complementing functions of two or more organs.
- This is also a correct statement as organs often work together to perform complex tasks that no single organ could achieve alone. For example, the kidneys and the endocrine system work together to regulate blood pressure and fluid balance.
Linking Assertion and Reason
- The reason directly explains the assertion by highlighting how organs complement each other to maintain homeostasis.
- For instance, during exercise, the heart rate increases (cardiovascular system), while the lungs facilitate increased oxygen intake (respiratory system), showcasing their coordinated efforts to maintain stable conditions in the body.
Conclusion
- Since both the assertion and the reason are true, and the reason correctly explains the assertion, the correct answer is option 'A': Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.
How does the pre-synaptic neuron transmit an impulse across the synaptic cleft to the post-synaptic neuron?- a)By electrical current flowing directly between the neurons across the synaptic cleft.
- b)By the release of neurotransmitters from synaptic vesicles into the synaptic cleft.
- c)By ion flow through the synaptic cleft without the need for neurotransmitters.
- d)By a direct connection between the axon terminal and the post-synaptic membrane.
Correct answer is option 'B'. Can you explain this answer?
a)
By electrical current flowing directly between the neurons across the synaptic cleft.
b)
By the release of neurotransmitters from synaptic vesicles into the synaptic cleft.
c)
By ion flow through the synaptic cleft without the need for neurotransmitters.
d)
By a direct connection between the axon terminal and the post-synaptic membrane.
|
|
Ambition Institute answered |
The pre-synaptic neuron transmits an impulse to the post-synaptic neuron by releasing neurotransmitters from synaptic vesicles into the synaptic cleft, where they bind to specific receptors on the post-synaptic membrane.
Match the following
- a)1-A, 2-B, 3-D, 4-C
- b)1-B, 2-A, 3-D, 4-C
- c) 1-A, 2-B, 3-C, 4-D
- d)1-B, 2-A, 3-C, 4-D
Correct answer is option 'C'. Can you explain this answer?
Match the following
a)
1-A, 2-B, 3-D, 4-C
b)
1-B, 2-A, 3-D, 4-C
c)
1-A, 2-B, 3-C, 4-D
d)
1-B, 2-A, 3-C, 4-D
|
Bs Academy answered |
Afferent fibres transmit impulses to the CNS.
Efferent fibres transmit impulses from the CNS.
The autonomic neural system controls involuntary organs and smooth muscles.
The somatic neural system relays impulses to skeletal muscles.
Efferent fibres transmit impulses from the CNS.
The autonomic neural system controls involuntary organs and smooth muscles.
The somatic neural system relays impulses to skeletal muscles.
Which of the following options illustrates the distribution of Na+ and K+ ions in a section of non-myelinated axon which is at resting potential?- a)
- b)
- c)
- d)
Correct answer is option 'A'. Can you explain this answer?
Which of the following options illustrates the distribution of Na+ and K+ ions in a section of non-myelinated axon which is at resting potential?
a)
b)
c)
d)
|
|
Hansa Sharma answered |
When a neuron is at resting potential i.e., not conducting any impulse; the axonal membrane is comparatively more permeable to K+ ions and nearly impermeable to Na+ ions. Consequently, the axoplasm inside the axon contains high concentration of K+ ions. In contrast, the fluid outside the axon has a high concentration of Na+ ions and thus forms a concentration gradient.
Which neural system is responsible for transmitting impulses to skeletal muscles?- a)Autonomic neural system
- b) Central neural system
- c)Somatic neural system
- d)Peripheral neural system
Correct answer is option 'C'. Can you explain this answer?
Which neural system is responsible for transmitting impulses to skeletal muscles?
a)
Autonomic neural system
b)
Central neural system
c)
Somatic neural system
d)
Peripheral neural system
|
|
Mohit Rajpoot answered |
The somatic neural system is the part of the nervous system that carries sensory and motor information to and from the central nervous system (CNS) to the skeletal muscles, enabling voluntary control of movements. This system is crucial for activities such as walking, writing, and any other actions that require conscious effort. An interesting fact is that the somatic nervous system can rapidly respond to stimuli, allowing for quick reflex actions, often without the need for conscious thought.
Topic in NCERT: Human Neural System
Line in NCERT: "The somatic neural system relays impulses from the CNS to skeletal muscles."
Topic in NCERT: Human Neural System
Line in NCERT: "The somatic neural system relays impulses from the CNS to skeletal muscles."
Read the given paragraph.
In the resting state, the axonal membrane is (i) with more (ii) charged ions outside than inside. This unequal distribution of ions os due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to (iii) and (2) the action of the (iv) which pumps (v) Na+ out of the neuron for every (vi) K+ brought in.
Select the option that correctly fills the blanks in the paragraph.
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'D'. Can you explain this answer?
Read the given paragraph.
In the resting state, the axonal membrane is (i) with more (ii) charged ions outside than inside. This unequal distribution of ions os due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to (iii) and (2) the action of the (iv) which pumps (v) Na+ out of the neuron for every (vi) K+ brought in.
Select the option that correctly fills the blanks in the paragraph.
In the resting state, the axonal membrane is (i) with more (ii) charged ions outside than inside. This unequal distribution of ions os due to (1) the selective permeability of the membrane, which forms an almost impenetrable barrier to (iii) and (2) the action of the (iv) which pumps (v) Na+ out of the neuron for every (vi) K+ brought in.
Select the option that correctly fills the blanks in the paragraph.
a)
a
b)
b
c)
c
d)
d
|
|
Vivek Patel answered |
In the resting state, the axonal membrane is polarised with more positively charged ions outside than inside, unequal distribution of ions is due to the selective permeability of the membrane, which forms impermeable barrier to sodium ion and the action of the sodium which pumps three sodium ions out of the neuron for every two potassium ions brought in.
Thus, the correct option is '(i) - polarised, (ii) - positively, (iii) - Na + , (iv) - sodium - potassium pump, (v) - three, (vi) - two.'
Thus, the correct option is '(i) - polarised, (ii) - positively, (iii) - Na + , (iv) - sodium - potassium pump, (v) - three, (vi) - two.'
What is the primary function of the visceral nervous system within the peripheral nervous system?- a) It controls voluntary movements of skeletal muscles.
- b) It relays impulses between the central nervous system and the viscera.
- c) It processes sensory information from the external environment.
- d) It regulates reflex actions in the spinal cord.
Correct answer is option 'B'. Can you explain this answer?
What is the primary function of the visceral nervous system within the peripheral nervous system?
a)
It controls voluntary movements of skeletal muscles.
b)
It relays impulses between the central nervous system and the viscera.
c)
It processes sensory information from the external environment.
d)
It regulates reflex actions in the spinal cord.
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Mohit Rajpoot answered |
The visceral nervous system is responsible for transporting impulses between the central nervous system and the internal organs, or viscera. This system manages involuntary bodily functions such as digestion and heart rate, which are critical for maintaining homeostasis. Interestingly, it is often divided into two main components: the sympathetic and parasympathetic nervous systems, which have opposing effects on organ function to help regulate bodily responses to stress and relaxation.
Topic in NCERT: Visceral nervous system
Line in NCERT: "Visceral nervous system is the part of the peripheral nervous system that comprises the whole complex of nerves, fibres, ganglia, and plexuses by which impulses travel from the central nervous system to the viscera and from the viscera to the central nervous system."
Which of the following is true about electrical synapses?- a)Electrical synapses involve the release of neurotransmitters into the synaptic cleft.
- b)Electrical synapses have a gap called the synaptic cleft that separates the neurons.
- c)Electrical synapses allow direct electrical current flow between the pre- and post-synaptic neurons.
- d)Electrical synapses are more common in the human nervous system than chemical synapses.
Correct answer is option 'C'. Can you explain this answer?
a)
Electrical synapses involve the release of neurotransmitters into the synaptic cleft.
b)
Electrical synapses have a gap called the synaptic cleft that separates the neurons.
c)
Electrical synapses allow direct electrical current flow between the pre- and post-synaptic neurons.
d)
Electrical synapses are more common in the human nervous system than chemical synapses.
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Mohit Rajpoot answered |
Electrical synapses allow direct electrical current flow between the pre- and post-synaptic neurons without the need for neurotransmitters or synaptic clefts. These synapses are rare in the human nervous system.
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that- a)nerve fibre is insulated by a medullary sheath
- b)sodium pump starts operating only at the cyton and then continues into the nerve fibre
- c)neurotransmitters are released by dendrites and not by axon endings
- d)neurotransmitters are released by the axon endings and not by dendrites
Correct answer is option 'D'. Can you explain this answer?
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
a)
nerve fibre is insulated by a medullary sheath
b)
sodium pump starts operating only at the cyton and then continues into the nerve fibre
c)
neurotransmitters are released by dendrites and not by axon endings
d)
neurotransmitters are released by the axon endings and not by dendrites
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Jyoti Sengupta answered |
A nerve impulse is transmitted from one neuron to another with the help of chemicals called neurotransmitters that are released by the axon endings formed by the membrane of a pre-synaptic neuron which may or may not be separated by synaptic cleft.
Which of the following systems is involved in controlling involuntary actions like heart rate and digestion?- a)Somatic neural system
- b)Autonomic neural system
- c)Sympathetic neural system
- d)Peripheral nervous system
Correct answer is option 'B'. Can you explain this answer?
Which of the following systems is involved in controlling involuntary actions like heart rate and digestion?
a)
Somatic neural system
b)
Autonomic neural system
c)
Sympathetic neural system
d)
Peripheral nervous system
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Stepway Academy answered |
The autonomic neural system controls involuntary actions like heart rate, digestion, and other functions of smooth muscles and involuntary organs.
Topic in NCERT: Autonomic Neural System
Line in NCERT: "The autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body."
Topic in NCERT: Autonomic Neural System
Line in NCERT: "The autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body."
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