The Reason That an Action Potential Is So Brief Is

Multiple Choice

The reason that an action potential is so brief is that

A) a wave of repolarization immediately follows the rising portion of the spike.
B) the closing of potassium gates allows the voltage difference across the neural membrane to be restored.
C) the channels for sodium movement remain open.
D) the sodium-potassium pump restores the electrical gradients.
E) the membrane limits electrical activity.