action potential
noun Physiology.
the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
Compare
nerve impulse.
Origin of action potential
First recorded in 1925–30
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British Dictionary definitions for action potential
action potential
noun
a localized change in electrical potential, from about –70 mV to +30 mV and back again, that occurs across a nerve fibre during transmission of a nerve impulse
Medical definitions for action potential
action potential
n.
The change in membrane potential occurring in nerve, muscle, or other excitable tissue when excitation occurs.
Scientific definitions for action potential
action potential
[ ăk′shən ]
A momentary change in electrical potential on the surface of a neuron or muscle cell. Nerve impulses are action potentials. They either stimulate a change in polarity in another neuron or cause a muscle cell to contract.
Cultural definitions for action potential
action potential
The rapid change in electric potential that parts of a nerve cell undergo when a nerve impulse is generated. Unlike ordinary electric current (see also current), which consists of the flow of electrons, the action potential involves the movement of sodium and potassium ions across the cell membrane.