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 |
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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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