A scientist observes a particular nerve fiber that is among the fastest at conducting action potentials in the body. Which of the following best describes its likely structure?
A) Large diameter and myelinated
B) Large diameter and unmyelinated
C) Small diameter and myelinated
D) Small diameter and unmyelinated

Question

Quizplus · Accepted Answer

Nerve fibers that conduct action potentials the fastest typically have a large diameter and are myelinated. The large diameter reduces resistance to the flow of ions, and myelination allows for saltatory conduction, both of which increase conduction speed.

A Scientist Observes a Particular Nerve Fiber That Is Among