Action potentials travel faster in _______ axons.
A) myelinated
B) unmyelinated
C) small diameter
D) Both a and c
E) Both b and c

Question

Quizplus · Accepted Answer

Myelinated axons have a layer of insulation (myelin) that insulates the axon and allows the action potential to travel faster.

Answer: E 
 Unmyelinated axons have a slower conduction speed, and small diameter axons have less surface area for ion exchange, which also results in a slower conduction speed. Therefore, the fastest action potentials travel in myelinated, large diameter axons.

Action Potentials Travel Faster in _______ Axons