Describe an action potential.

A stimulus excites a neuron by causing the opening of sodium channels.
This causes an influx of sodium which causes the opening of other voltage-gated sodium channels.
This causes the membrane to depolarise to threshold. 
Depolarisation is followed by hyperpolarisation where potassium ions leave the cell. 
This returns the membrane to resting potential. 

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Answered by Maciek K. Biology tutor

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