Which of the following is responsible for the repolarization of the membrane after the peak of the action potential?
A. The membrane potential reaches the Na+ equilibrium potential.
B. The voltage-gated Na+ channels begin to inactivate.
C. The slowly opening voltage-gated K+ channels permit K+ to enter.
D. The influx of Na+ and the outflow of K+ are equal.
E. There is no longer a gradient to drive K+ into the cell.
ANS: B
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