Question

How does myelination affect the propagation of an action potential?

a. It speeds propagation by increasing the density of voltage-gated ion channels.
b. It speeds propagation by increasing electrochemical gradients favoring Na+ entry
c. It speeds propagation because cations do not leak out of the membrane as they spread down the axon
d. It slows down propagation because Na+ channels exist only at unmyelinated nodes (nodes of Ranvier).

Answer 1

Myelination affect the propagation of an action potential -

c. It speeds propagation because cations do not leak out of the membrane as they spread down the axon

Step-by-step explanation:

In the nervous system , the rate of action potential conduction resists the flow of the information , since , for the action potential conduction , active and passive flow of current is required .

In the myelination of axon , the passive movement of electrical current is increased by insulating the axonal membrane and there by decreasing the current leakage , and hence , local current can flow passively.