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.

DescriptionVentricular myocyte action potential.svg	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
Date	7 August 2009
Source	This file was derived from: Action potential.png
Author	PNG: Quasar SVG: Mnokel (talk)
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Other versions	Derivative works of this file:  Action potential ventr myocyte.gif

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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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