File:Action potential propagation animation.gif

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search
Action_potential_propagation_animation.gif(649 × 480 pixels, file size: 3.2 MB, MIME type: image/gif, looped, 51 frames, 13 s)


This animated gif illustrates action potential propagation in an axon. Three types of ion channel are shown: potassium "leak" channels (blue), voltage-gate sodium channels (red) and voltage-gated potassium channels (green). The movement of positively-charged sodium and potassium ions through these ion channels controls the membrane potential of the axon. The negative-inside resting potential is mostly determined by potassium ions leaving the cell through leak channels. Action potentials are initiated in the axon initial segment after neurotransmitter activates excitatory receptors in the neuron's dendrites and cell body. This depolarizes the axon initial segment to the threshold voltage for opening of voltage-gated sodium channels. Sodium ions entering through the sodium channels shift the membrane potential to positive-inside, approaching the sodium equilibrium potential. The positive-inside voltage during the action potential in the initial segment causes the adjacent part of the axon membrane to reach threshold. When positive-inside membrane potentials are reached, voltage-gated potassium channels open and voltage-gate sodium channels close. Potassium ions leaving the axon through voltage-gated potassium channels return the membrane potential to negative-inside values near the potassium equilibrium potential. When the voltage-gated potassium channels gate shut, the membrane potential returns to the resting potential.

English: I (John Schmidt) made this animated GIF with images that I made for Image:Action potential video.ogg.
Source Mars
Author John Schmidt


I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head 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.
w:en:Creative Commons

attribution share alike

This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International, 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
  • share alike – If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.

You may select the license of your choice.
Annotations This image is annotated: View the annotations at Commons

File history

Click on a date/time to view the file as it appeared at that time.

current16:07, 19 August 2008Thumbnail for version as of 16:07, 19 August 2008649 × 480 (3.2 MB)JWSchmidt (talk | contribs){{Information |Description={{en|1=I (John Schmidt) made this animated GIF with images that I made for Image:Action potential video.ogg.}} |Source=Mars |Author=John Schmidt |Date=August 18, 2008 |Permission= |other_versions= }} <!--{{ImageUpload|full
  • You cannot overwrite this file.

There are no pages that link to this file.

File usage on other wikis