In some cells, an afterpotential occurs because
A. the extracellular Na+ concentration is reduced.
B. the permeability to Na+ continues longer than necessary.
C. the Na+ continue to enter the cell after depolarization is finished.
D. there is prolonged, elevated permeability to K+ during repolarization.
E. the sodium-potassium pump is actively exchanging ions across the membrane.
Answer: D
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