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

Question

Quizplus · Accepted Answer

During repolarization, there is prolonged, elevated permeability to potassium ions, which causes an efflux of potassium ions out of the cell. This efflux of positive charge causes the membrane potential to become more negative than the resting potential, creating an afterpotential.

In Some Cells,an Afterpotential Occurs Because