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absolute refractory period

period of depolarization of the neuron membrane during which it cannot respond to a second stimulus


reversal of the resting potential due to an influx of sodium ions


period during which potassium ions diffuse out of the neuron due to a change in membrane permeability

relative refractory period

period of repolarization when only a strong stimulus will elicit an action potential

sodium potassium pump

mechanism in which ATP is used to move sodium out of the cell and potassium into the cell; restores the resting membrane voltage and intracellular ionic concentrations

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