Action potential
A. Schematic and B. actual action potential recordings. The action potential is a clear example of how changes in membrane potential can act as a signal.
These diagrams of real and schematic action potential indicate peak, overshoot, rising phase, falling phase, threshold, failed initiations, resting potential, stimulus, undershoot.
Source
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"Action potential vert."
http://en.wikipedia.org/wiki/File:Action_potential_vert.png
Wikipedia
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