The purpose of the myelin that surrounds the axon is to
A)keep nerve cells continually active.
B)help electrical currents cross the synapse completely.
C)repair neurons within the peripheral nervous system.
D)protect, insulate, and speed the transmission of an impulse down the axon.

Question

Quizplus · Accepted Answer

The myelin sheath surrounds the axon of a neuron and serves to protect, insulate, and speed up the transmission of electrical impulses down the axon. The myelin allows the electrical impulse to jump from node to node, rather than having to travel the full length of the axon, increasing the speed of the transmission.

The Purpose of the Myelin That Surrounds the Axon Is