The nodes of Ranvier are:
A) unmyelinated portions of an axon
B) the bulblike endings of axons
C) receptor sites on dendrites
D) myelinated portions of an axon

Question

Quizplus · Accepted Answer

The nodes of Ranvier are unmyelinated portions of an axon. They are small gaps in the myelin sheath that allow for the propagation of salutatory conduction in myelinated nerve fibers. Choice B and C are incorrect as they do not describe the nodes of Ranvier. Choice D is incorrect as myelinated portions of an axon are covered in myelin sheath, which is the opposite of the definition of nodes of Ranvier.

The Nodes of Ranvier Are