Why does repolarization occura. The increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level.b. the extra efflux of potassium ions causes the membrane potential to become slighly more positive than the resting valuec. more sodium ions diffuse into the cell than potassium ions diffuse out of itd. potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close.

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