The overall speed of an action potential depends on the size and shape of the axon and, in general, the thinner the axon the faster the message will travel.

Name: The overall speed of an action potential depends on the size and shape of the axon and, in general, the thinner the axon the faster the message will travel.
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The overall speed of an action potential actually increases with the diameter of the axon; thicker axons conduct signals faster due to lower internal resistance to the flow of ions.

The Overall Speed of an Action Potential Depends on the Size