Action Current

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action current

[′ak·shən ‚kə·rənt]
The electric current accompanying membrane depolarization and repolarization in an excitable cell.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Current, Action


in physiology, the electric current that develops in nerve and muscle cells and in some plant cells between their excited areas and adjacent resting areas. It is caused by changes in the ionic permeability of the cell membrane and in potential that occur in the excited areas, and is recorded by extracellular electrodes. Action current plays an important role in the distribution of action potential along a cell or fiber.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
This phase shift is an invaluable tool in investigating whether a noticeable event occurs in the MR signal due to action currents in nerves.
We have investigated the phase shifts due to four different measured action currents, from the frog sciatic nerve, the crayfish medial giant axon, the squid giant axon, and the human median nerve.
Experiments were performed to record action currents from the bull frog (Rana catesbeiana) sciatic nerve bundle in vitro.
Troung & Song (2006) recently introduced another method called "Lorentz Effect Imaging" for detection of action currents using MRI.
In the heart, a very large volume of cardiac tissue is simultaneously active, and this may provide a good starting place to search for action currents recorded using MRI (although motion artifacts will certainly be a problem).

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