Which phase of an action potential is depicted here?
A)Resting phase
B)Depolarization
C)Repolarization
D)Hyperpolarization

Question

Which phase of an action potential is depicted here?
A)Resting phase 
B)Depolarization 
C)Repolarization 
D)Hyperpolarization

Quizplus · Accepted Answer

The graph depicts the phase of an action potential where the membrane potential is returning to its resting state, which is called repolarization. The peak of the action potential, where the membrane potential reaches its highest point after depolarization, is not shown in the graph. There is no indication of hyperpolarization either, which is when the membrane potential becomes more negative than the resting state. Therefore, the best choice is C, repolarization.

Which Phase of an Action Potential Is Depicted Here