Which of the following events is NOT a characteristic of an action potential?
A. In repolarization, K+ flow out of the cell.
B. As Na+ enter, the inside of the plasma membrane becomes more negative.
C. The plasma membrane becomes highly permeable to Na+ and depolarization results.
D. At the peak of depolarization, Na+ channels begin to close and K+ channels open.
E. Action potentials occur according to the all-or-none principle.
Answer: B
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