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Voltage-gated Na+ channels open upon reaching what state? overshoot repolarization resting membrane potential Threshold

Voltage-gated Na+ channels open upon reaching what state?

overshoot

repolarization

resting membrane potential

Threshold

Science   Anatomy-And-Physiology   
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Answer #1

The answer is threshold
An action potential is an electrical signal caused by rapid change in the resting membrane potential (-70mV).This change is caused when threshold potential(-55mV) reached.
When threshold reached,more sodium will enter the cells causing further depolarisation and hence rise to action potential.

Overshoot refers to the part of positive membrane potential within the cell.Repolarisation is the state at which the membrane potential return back to the negative voltage and hence sodium channels close.

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