Which of the following statements about an action potential is NOT true?
A. An action potential takes 2 to 5 seconds.
B. Repolarization occurs when potassium leaves the axon.
C. There is a rapid change in polarity from about -70 mV to about +35 mV during depolarization.
D. Potassium gates open after the sodium gates and allow potassium ions to leave the cell.
E. Depolarization occurs when sodium gates open and allow sodium ions to enter the axon.
Answer: A
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