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Depolarization
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==Hyperpolarization== The process of repolarization causes an overshoot in the potential of the cell. Potassium ions continue to move out of the [[axon]] so much that the resting potential is exceeded and the new cell potential becomes more negative than the resting potential. The resting potential is ultimately re-established by the closing of all voltage-gated ion channels and the activity of the sodium potassium ion pump.<ref>Salters-Nuffield Advanced Biology for Edexcel A2 Biology. Pearson Wducation, by Angela Hall, 2009, {{ISBN|9781408205914}}</ref>
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