At the end of an action potential ____.

A) the membrane potential declines to the resting state
B) the membrane voltage drops to zero
C) sodium and potassium channels remain open
D) the membrane potential exceeds +50 mV
E) potassium moves into the cell

At the end of an action potential, the membrane potential returns to the resting state, which is typically around -70 mV. This occurs because potassium channels remain open and potassium ions move out of the cell, allowing the membrane potential to return to its resting level. Sodium channels are usually closed at this point, so sodium ions are not entering the cell. Therefore, choices B, C, D, and E are incorrect.