What stops the rising phase of the action potential?
A) The K⁺ gate closes.
B) The Na⁺ activation gate opens.
C) The Na⁺ inactivation gate closes.
D) The Na⁺ inactivation gate opens.
E) The sodium activation gate closes.

Question

Quizplus · Accepted Answer

The rising phase of the action potential is caused by the rapid influx of Na⁺ ions into the cell, resulting in depolarization. The Na⁺ inactivation gate closes to stop more Na⁺ ions from entering the cell, which stops the rising phase of the action potential. Therefore, choice C is the correct answer.

What Stops the Rising Phase of the Action Potential