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Question

The diffusion of potassium ions out of a neuron after depolarisation causes : _____.


A

Repolarization

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B

Action potential

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C

Nerve impulse

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D

Depolarization

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Solution

The correct option is A

Repolarization


The diffusion of potassium ions out of a neuron causes regain of resting potential. The resting membrane potential is restored due to action of voltage gated (K+) channels which open due to membrane depolarisation and cause efflux of (K+) ions out of the neuron. It continues till the resting potential becomes -70 mV. This process of attaining resting potential after action potential is called Repolarisation.


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