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Assertion Reason Test: Neural Control & Coordination


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10 Questions MCQ Test Additional Study Material for NEET | Assertion Reason Test: Neural Control & Coordination

Assertion Reason Test: Neural Control & Coordination for NEET 2022 is part of Additional Study Material for NEET preparation. The Assertion Reason Test: Neural Control & Coordination questions and answers have been prepared according to the NEET exam syllabus.The Assertion Reason Test: Neural Control & Coordination MCQs are made for NEET 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion Reason Test: Neural Control & Coordination below.
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Assertion Reason Test: Neural Control & Coordination - Question 1

A: In the nervous system generation of action potential depends upon influx of sodium ions into axoplasm.

R: Influx of sodium ions during nerve impulse generation is due to efflux of potassium ions.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 1 In the nervous system generation of action potential is due to influx of sodium ions. During action potential K+ leaky channels are closed.

Assertion Reason Test: Neural Control & Coordination - Question 2

A: Presence of myelin sheath increases the rate of conduction of nerve impulse.

R: Ionic channels are absent in the area covered by myelin sheath therefore, depolarization occurs only at the nodes of Ranvier, resulting in saltatory or jumping conduction.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 2 Presence of myelin sheath causes fast conduction ionic channels are less in between nodes of Ranvier and concentrated more in nodes of Ranvier.

Assertion Reason Test: Neural Control & Coordination - Question 3

A: Receptors in the tendon, joints give information regarding the position and movements of different parts of the body.

R: These are termed as noci-receptors.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 3 Receptors present in the tendon, ligaments joints give information regarding different body parts and called proprioceptors, Noci-receptors are pain receptors.

Assertion Reason Test: Neural Control & Coordination - Question 4

A: Sharpest vision is in fovea centralis.

R: The relationship of receptor to bipolar cells to ganglion cells is 1 : 1 : 1 within fovea centralis.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 4

Fovea centralis is the area of most acute vision of the retina and here the ratio of rods, cones and bipolar cells and ganglion cells is 1:1:1. This acute vision is due to the high number of cones in the fovea centralis.

Assertion Reason Test: Neural Control & Coordination - Question 5

A: Postganglionic nerve fibre of parasympathetic nervous system have acetylcholine while sympathetic nervous system have adrenaline as the neurotransmitter.

R: Sympathetic nervous system inhibits the intestinal peristalsis while parasympathetic stimulates peristalsis.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 5  

Sympathetic system inhibits peristalsis of intestine while parasympathetic system enhances it

Assertion Reason Test: Neural Control & Coordination - Question 6

A: Transmission of the nerve impulse across a synapse is accomplished by neurotransmitters.

R: Transmission across a synapse usually requires neuro-transmitters because there is small space, i.e., synaptic cleft, that separates one neuron from another.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 6 Transmission of nerve impulses across a synaptic cleft (a small space separating two (10 – 20 mm, neurons), occurs with the help of neurotransmitters due to presence of space, this is known as chemical synapse while in the electrical synapse (5nm) does not require neurotransmitter due to low space.

Assertion Reason Test: Neural Control & Coordination - Question 7

A: Sense organs do not interpret the stimulus, it is done by the brain.

R: Sense organs are transducers. They transform the energy of a stimulus to the energy of nerve impulses.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 7

Sense organs act as transducers, they transform the sensation into nerve impulse and transmit via sensory neurons to the brain where the association and interpretation of the sensation occurs in their respective sensory areas.

Assertion Reason Test: Neural Control & Coordination - Question 8

A: The imbalance in the concentration of Na+, K+ and proteins generates the resting potential.

R: To maintain the unequal distribution of Na+ and K+, the neurons use electrical energy.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 8 The imbalance of K+, Na+ and proteins cause resting membrane potential and during resting membrane, the resting potential is due to transfer of K+ ions down the concentration gradient inside the axolemma and Na+, voltage gated channels are closed.

Assertion Reason Test: Neural Control & Coordination - Question 9

A: Retina is arranged anatomically in reverse order from what might be expected.

R: The receptor cells are, towards the outside and ganglionic cells towards the inside and light must pass through the nerve cells to reach them.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 9 Retina is arranged anatomically such that light passes through nerves then to inner photosensitive cone and rod cells

Assertion Reason Test: Neural Control & Coordination - Question 10

A: The brain reaches between 75 and 80 percent of adult size within the first two years, and its full size at the age of 6 years.

R: From an evolutionary point of view, human gestation period is belived to be shortening.

Detailed Solution for Assertion Reason Test: Neural Control & Coordination - Question 10 Brain reaches 75 – 80% of adult size by the age of two and full size at the age of 6 year With evolution the gestation period is believed to be reducing.
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