Respuesta :
As Phase 1 of the action potential is initiated, the membrane is repolarized. This is caused by the efflux of K+ ions.
Repolarization of Neurons
Repolarization is the process of return of the membrane potential to the negative value before depolarization. During depolarization, the membrane potential becomes a positive value which is returned to a negative value during repolarization.
During repolarization, the sodium channels close and the voltage-gated potassium channels open up. This reduces the permeability of the membrane to the sodium which causes the decline in the entry of sodium ions. During this time the voltage-gated potassium channels are opened up and the potassium ions come out. This restores the negative membrane potential of the cell membrane.
The return of a negative charge from a positive charge lasts only for a brief moment. The process lacks only a few milliseconds. Various channels involved in repolarization are A-type channels, Ca2+ activated K+ channels, delayed rectifiers, etc.
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