File:Action potential propagation animation.gif

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Action_potential_propagation_animation.gif(649 × 480 pixels, file size: 3.2 MB, MIME type: image/gif, looped, 51 frames, 13 s)

Summary[edit]

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.

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


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I, the copyright holder of this work, hereby publish it under the following licenses:
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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
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