The speed of propagation of an action potential along an axon is increased by A) a decrease in the insulation of the axon. B) an increase in the length of the axon. C) an increase in the diameter of the axon. D) the number of Na⁺ channels in the axon. E) a decrease in the concentration of Na⁺ ions inside the axon.

Question

Quizplus · Accepted Answer

An increase in the diameter of the axon reduces the axonal resistance to the flow of electric current, thereby increasing the speed of action potential propagation.

The Speed of Propagation of an Action Potential Along an Axon