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Phases of a cardiac action potential. The sharp rise in voltage ("0") corresponds to the influx of sodium ions, whereas the two decays ("1" and "3", respectively) correspond to the sodium-channel inactivation and the repolarizing efflux of potassium ions. The characteristic plateau ("2") results from the opening of voltage-sensitive calcium channels.

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Description
English: Basic ventricular myocyte action potential (with labels).
0: depolarization: voltage-gated sodium channels open allowing influx of sodium ions
1: initial repolarization: inactivation of voltage-gated sodium channels; voltage-gated potassium channels begin to open allowing minor efflux of potassium ions
2: plateau: voltage-gated calcium channels open allowing influx of calcium ions triggering calcium release from sarcoplasmic reticulum which results in myocyte contraction
3: rapid repolarization: voltage-gated slow potassium channels open allowing major efflux of potassium ions; voltage-gated calcium channels close
4: resting potential: potassium channels allow for potassium permeability
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Other versions Derivative works of this file:  Action potential ventr myocyte.gif


This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: changed to .svg. The original can be viewed here: Action potential.png. Modifications made by Quasar.

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  • File:Action_potential.png licensed with Cc-by-sa-3.0-migrated-with-disclaimers, GFDL-en
    • 2008-06-23T21:14:38Z Rjgalindo 610x385 (10165 Bytes) {{Information |Description=Basic cardiac action potential (with labels) - all languages. |Source=[[:en:Image:Action potential.png|Image:Action potential.png]] |Date=[http://upload.wikimedia.org/wikipedia/en/f/fd/Action_potent

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7 August 2009

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Date/TimeThumbnailDimensionsUserComment
current16:38, 21 February 2014Thumbnail for version as of 16:38, 21 February 2014570 × 340 (1 KB)RehuaOutlines to text, removed Inkscape tags to shrink file
12:22, 13 January 2010Thumbnail for version as of 12:22, 13 January 2010570 × 340 (11 KB)Mnokel{{Information |Description=Basic cardiac action potential (with labels) - all languages. Created by User:Quasar 18:07, 7 August 2009 (UTC) to replace File:Action_potential.png |Source=*File:Action_potential.png Uploaded from en.wikipedia to comm

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