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Question

Action potential in a polarised neuron triggers _____.


A

Depolarization

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B

Hyperpolarization

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C

Repolarization

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D

No change

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Solution

The correct option is C

Repolarization


The onset of the action potential in a polarized neuron triggers repolarisation.

The onset of an action potential is marked by the opening of voltage-gated Na+ channels. The depolarization that occurs due to this, causes the neuron membrane to attain a voltage that triggers the opening of voltage-gated K+ channels. Then K+ ions rush out through this channels, reducing the positive charge inside the neuron, it causes repolarization of the neuronal membrane.


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