What happens as the action potential reaches its peak?

Question

Quizplus · Accepted Answer

During the peak of the action potential, the membrane potential becomes more positive than the resting potential. This causes the inactivation gates of Na⁺ channels to close, preventing any further influx of sodium ions. This leads to the repolarization phase of the action potential, during which the activation gates of K⁺ channels open, allowing the efflux of potassium ions. Therefore, choice A is the correct answer as it explains what happens at the peak of the action potential. Choices B, C, and D do not accurately describe this event.

What Happens as the Action Potential Reaches Its Peak