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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.
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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.
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New Atlas, 15 Oct. 2024
In both brains, neurons fire action potentials, use common neurotransmitters, etc.
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Tom Hawking, Popular Science, 2 Oct. 2024
That hindered Miami’s play action potential, which led to Gesicki’s snap count being limited.
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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 8 Feb. 2025.
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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