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Sodium Wave Depolarisation Ions Diffuse Region Enter Neurone

A wave of depolarization propagates as diffusing sodium ions trigger adjacent sodium channels to open.

A wave of depolarization travels as diffusing sodium ions in the cytoplasm trigger opening of sodium channels in adjacent membrane regions.

Front Wave of depolarisation
Back Some sodium ions the enter the neurone can diffuse sideways which causes sodium ion channels in next region to open and sodium ions diffuse into that region which causes a wave of depolarisation to move away from parts of the membrane in refractory period as they can't fire an action potential

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