Q. No.Consider the following statements:
I. The resting axonal membrane is nearly impermeable to sodium ions.
II. Depolarization of the axonal membrane is due to influx of sodium ions.
III. The size of the action potential, if produced, does not depend on the strength of the stimulus.
Which of the above statements are true?
1. I and II only 2. I and III only
3. II and III only 4. I, II, and III
I. The resting axonal membrane is nearly impermeable to sodium ions.
II. Depolarization of the axonal membrane is due to influx of sodium ions.
III. The size of the action potential, if produced, does not depend on the strength of the stimulus.
Which of the above statements are true?
1. I and II only 2. I and III only
3. II and III only 4. I, II, and III
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Consider the following statements:
| I: | Acetylcholine is released at the electrical synapse. |
| II: | Electrical synapses are faster. |
| III: | It is more difficult to regulate an electrical synapse with respect to a chemical synapse. |
Which of the above statements are true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III
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Identify the correct statement regarding the following diagram:
1. B and F are filled with endolymph
2. C is filled with perilymph
3. Hair cells press against E to generate nerve impulses
4. D is the sensory organ of hearing and has auditory receptors
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In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed would drive
1. K+ into the cell
2. Na+ into the cell
3. Na+ out of the cell
4. K+ and Na+ out of the cell
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Column I list the parts of the human brain and column II lists the functions. Match the two columns and identify the correct choice from those given :
|
Column I |
Column II |
||
|
A. |
Cerebrum |
p. |
Controls the pituitary |
|
B. |
Cerebellum |
q. |
Controls vision and hearing |
|
C. |
Hypothalamus |
r. |
Controls the rate of heartbeat |
|
D. |
Midbrain |
s. |
Seat of intelligence |
|
t. |
Maintains body posture |
| A | B | C | D | |
| 1. | t | r | q | p |
| 2. | r | t | q | p |
| 3. | t | s | p | q |
| 4. | t | s | p | q |
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An axon has 4 terminal ends connected with dendrites of four different neurons. Its nerve impulse will
1. Become weak due to distribution into four
2. Travel in all the four neurons with equal strength
3. Pass on to one neuron only
4. Travel to none because the movement of impulse is from dendrite to axon
| Assertion (A): | The resting membrane potential in a neuron is much closer to the equilibrium potential of K+ ions than it is to equilibrium potential of Na+ ions. |
| Reason (R): | While potassium is the principal cation in the intracellular fluid, sodium is the principal cation in the extracellular fluid. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
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| Assertion (A): | Once initiated, the action potential has a magnitude that is independent of the strength of the triggering stimulus. |
| Reason (R): | Action potentials are all or none responses to stimuli. |
In the light of the above statements choose the correct answer from the options given below:
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Assertion: The smaller the size of an axon the higher will be its conduction velocity.
Reason: The smaller the size of an axon the lesser is the resistance to current flow.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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