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# Ionic Basis of Action Potential

NEURO-WXCFME

During the generation of an action potential, changing the membrane potential to a level more positive than the resting potential (i.e. depolarization) leads to which one of the following effects?

A

An early influx of ${ Ca }^{ 2+ }$, followed by a delayed efflux of ${ K }^{ + }$.

B

An early influx of ${ Na }^{ + }$, followed by a delayed efflux of ${ K }^{ + }$.

C

An early efflux of ${ K }^{ + }$, followed by a delayed influx of ${ Na }^{ + }$.

D

An early influx of ${ Na }^{ + }$, followed by a delayed efflux of ${ Cl }^{ - }$.