Dictionary

action potential

noun

Definition of ACTION POTENTIAL

:  a momentary reversal in electrical potential across a plasma membrane (as of a neuron or muscle fiber) that occurs when a cell has been activated by a stimulus

First Known Use of ACTION POTENTIAL

1926

action potential

noun    (Medical Dictionary)

Medical Definition of ACTION POTENTIAL

:  a momentary reversal in the potential difference across a plasma membrane (as of a nerve cell or muscle fiber) that occurs when a cell has been activated by a stimulus—called also spike potential; compare resting potential; see afterpotential, generator potential, prepotential

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