Nerve Impulse

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Resting Potential

Intrinsic proteins on the plasma membrane of the axon contain sodium-potassium pumps and individual channels.

A resting potential of 65MV outside the axon is created when 3 sodium ions are actively transported out of the axon, as 2 potassium ions are transported in.

This creates a higher charge outside the axon.

Potassium ions then diffuse through channels out the axon, and as there are less sodium channels open, there is a greater influx of


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