Action Current


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action current

[′ak·shən ‚kə·rənt]
(physiology)
The electric current accompanying membrane depolarization and repolarization in an excitable cell.

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.

References in periodicals archive ?
Action currents in nerves have been directly measured using neuromagnetic current probes by us and our former colleagues (Gielen et al.
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.
Troung & Song (2006) recently introduced another method called "Lorentz Effect Imaging" for detection of action currents using MRI.

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