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A : In the nervous system generation ...

A : In the nervous system generation of action potential depends upon influx of sodium ion into axoplasm.
R : Influx of sodium ion during nerve impulse generation is due to efflux of potassium ions .

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).

C

If Assertion is true statement but Reason is false, then mark (3).

D

If both Assertion and Reason are false statements, then mark (4).

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that in the nervous system, the generation of action potential depends on the influx of sodium ions into the axoplasm. - This statement is **true** because action potentials are initiated when sodium channels open, allowing sodium ions to flow into the neuron, leading to depolarization. 2. **Understanding the Reason**: - The reason provided states that the influx of sodium ions during nerve impulse generation is due to the efflux of potassium ions. - This statement is **false**. The influx of sodium ions does not depend on the efflux of potassium ions. Instead, the influx of sodium is a separate process that occurs when voltage-gated sodium channels open. 3. **Conclusion**: - Since the assertion is true and the reason is false, the correct answer is that the assertion is true but the reason is false. ### Final Answer: - Assertion (A) is true. - Reason (R) is false.
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