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action potential
noun
: 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
Examples of action potential in a Sentence
Recent Examples on the Web
By way of explanation, neurons communicate through electrical currents called action potentials, which can be excitatory or inhibitory.
—New Atlas, 15 Oct. 2024
Excitatory currents prompt one neuron to pass information on to the next through an action potential; inhibitory currents reduce the likelihood that information will be passed on.
—New Atlas, 15 Oct. 2024
In both brains, neurons fire action potentials, use common neurotransmitters, etc.
—Tom Hawking, Popular Science, 2 Oct. 2024
That hindered Miami’s play action potential, which led to Gesicki’s snap count being limited.
—Omar Kelly, Miami Herald, 19 June 2024
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Word History
First Known Use
1913, in the meaning defined above
Dictionary Entries Near action potential
Cite this Entry
“Action potential.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/action%20potential. Accessed 16 Dec. 2024.
Medical Definition
action potential
noun
: 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, prepotentialMore from Merriam-Webster on action potential
Britannica.com: Encyclopedia article about action potential
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