Which Statement Is True About the Development of an Action

Multiple Choice

Which statement is true about the development of an action potential?

A) Depolarization continues until a potential of +15 mV is reached.
B) It requires three types of gated channels.
C) The action potential ends when the polarity across the membrane reaches +40 mV.
D) Depolarization occurs when sodium gates open and allow sodium ions to enter the axon.
E) Potassium gates open before the sodium gates and allow potassium ions to leave the axon.