A physiologist testing signal transduction rates in two different nerves notices that one fiber conducts signals much faster than the other. Which is the most likely difference between the two?
A)The faster nerve fiber has more axons.
B)The faster nerve fiber has more dendrites.
C)The faster nerve fiber is myelinated and the slower one is not.
D)The slower nerve fiber is myelinated and the faster one is not.

Question

Quizplus · Accepted Answer

Myelination greatly speeds up signal transduction in nerve fibers. The faster nerve fiber most likely has myelin sheaths around its axons, while the slower one does not. Choice A and B are unrelated to conduction speed, and D is the reverse of the correct answer.

A Physiologist Testing Signal Transduction Rates in Two Different Nerves