MHT CET · BIOLOGY · STD 12 - 9. Control and Coordination

During depolarization of a nerve ____________ .

A both the voltage \(Na ^{+}\) and \(K ^{+}\) gated channels remain closed.
B action potential is maintained at -50 to -100 millivolts.
C \(Na ^{+}\) gates open but \(K ^{+}\) gates remain closed.
D \(Na ^{+}\) gates remain closed but \(K ^{+}\) gates open.

Verified Solution

Answer & Solution

Correct Answer

(C) \(Na ^{+}\) gates open but \(K ^{+}\) gates remain closed.

Step-by-step Solution

Detailed explanation

During resting potential, both gates are closed, and resting potential is maintained. However, during depolarisation, the \(\mathrm{Na}^{+}\)gates open but not the \(\mathrm{K}^{+}\)gates.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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