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Resting potential-action potential-excitation threshold

How dissimilar are the concepts of resting potential, action potential and excitation threshold regarding neurons?

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Action potential is the utmost positive voltage level attained by the neuron in the procedure of neuronal activation, approximately + 35 mV. The action potential triggers the depolarization of the neighboring areas of the plasma membrane and therefore the propagation of the impulse all along the neuron.

Resting potential is a membrane voltage whenever the cell is not excited, around –70 mV. Excitation threshold is the voltage level, around –50 mV that the initial depolarization should reach for the action potential to be achieved.

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