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.
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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{{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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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.
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
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the
same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL
licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the
Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. Subject to
disclaimers.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue
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.
Original upload log
This image is a derivative work of the following images:
{{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
File usage
The following pages on the English Wikipedia use this file (pages on other projects are not listed):