Speed of conduction of action potentials along an axon is increased in
A) axons with a larger diameter
B) axons that are myelinated
C) axons with more axon collaterals
D) axons with both myelin and a larger diameter

Question

Quizplus · Accepted Answer

Both myelin and a larger diameter of axons result in an increased speed of conduction of action potentials. Myelin acts as an insulator, preventing ion leakage and allowing for faster depolarization of the axon. A larger diameter also reduces resistance to the flow of ions, allowing for faster conduction. Axon collaterals have no direct effect on the speed of conduction of action potentials.

Speed of Conduction of Action Potentials Along an Axon Is