Action potential is the maximum positive voltage level achieved by the neuron in the process of neuronal activation, around + 35 mV. The action potential triggers the depolarization of the neighboring regions of the plasma membrane and thus the propagation of the impulse along the neuron.
Resting potential is the membrane voltage when the cell is not excited, about –70 mV.
Excitation threshold is the voltage level, about –50 mV, that the initial depolarization must reach for the action potential to be attained.
