An axon travels from the spinal cord to the legs.It is surrounded by a concentric ring of lipid-rich cell membrane that insulates the axon and speeds up its transmission of electrical impulses.This covering is composed of
A) synapses.
B) dendrites.
C) Schwann cells.
D) nodes of Ranvier.
E) oligodendrocytes.

Question

Quizplus · Accepted Answer

The concentric ring of lipid-rich cell membrane surrounding the axon is specifically describing the myelin sheath, which is composed of Schwann cells. Synapses, dendrites, nodes of Ranvier, and oligodendrocytes are all involved in nerve function, but are not the primary components of the myelin sheath.

An Axon Travels from the Spinal Cord to the Legs