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Nerve Impulse Transmission within a Neuron: Action Potential

Action potential travel along a neuronal axon
The action potential is conducted down the axon as the axon membrane depolarizes, then repolarizes.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, How Neurons Communicate. October 17, 2013."
http://cnx.org/content/m44748/latest/Figure_35_02_04.png
OpenStax CNX
CC BY 3.0.