action potential

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Related to Nerve signal: Neurotransmitters, axon

action potential

n.
A momentary change in electrical potential on the surface of a cell, especially of a nerve or muscle cell, that occurs when it is stimulated, resulting in the transmission of an electrical impulse.

action potential

n
(Physiology) 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

ac′tion poten`tial


n.
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.

action potential

- A brief electrical signal transmitted along a nerve or muscle fiber following stimulation.
See also related terms for nerve.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.action potential - the local voltage change across the cell wall as a nerve impulse is transmittedaction potential - the local voltage change across the cell wall as a nerve impulse is transmitted
nerve impulse, nervous impulse, neural impulse, impulse - the electrical discharge that travels along a nerve fiber; "they demonstrated the transmission of impulses from the cortex to the hypothalamus"
References in periodicals archive ?
One test recorded the time for a nerve signal to travel from the retina to the visual cortex--a measurement that is typically slowed in MS patients as the protective coatings around their nerves are attacked by their immune system.
Luca Prosperini, explained that the study was able to find that there were improvements in the protective coating of the nerves in the areas of the brain that involve balance and movement and that the improvements showed that there is better nerve signal transmission in the brain.
To obtain the nerve signal, amplified nerve activity was split in two: 1) to feed an analog integrator before entering the digitalizing board and 2) to be acquired digitally as raw data by the digitalizing board.
Myelin disorders can affect nerve signal transmission in the brain and spinal cord, leading to cognitive, motor and sensory problems.
If myelin-making cells could be transplanted into the central nervous system they might be able to repair damaged myelin, regenerate injured axons, and restore nerve signal conduction.
The nerve signal continues up to the brain, where the information about what has happened is analyzed.
When the patient thinks 'Close my hand; the [rewired] muscle acts as a biological amplifier of the nerve signal," Kuiken says.
They found that the strength of the nerve signal varied from place to place on the membrane and it appeared that the receptors are not evenly distributed, but rather are grouped into distinct sites, each engaging most strongly with a particular type of scent.
Alzheimer's patients lack the normal number of one type of receptor that binds acetylcholine in the brain, making them less responsive to that nerve signal.
In LTD, nerve signal transmissions at particular synapses, or junctions between nerve cells, is depressed for an extended period, usually lasting hours.
If not, the condition is probably organic -- either related to minor blood vessel leakage or an interruption of the nerve signal.
This cleanup prepares the synapse for the next nerve signal and protects neurons from toxic effects.