Which of the following is most descriptive of the nodes of Ranvier?
A)Neurotransmitter-storing vesicles in the axon terminals
B)Exposed (unmyelinated) axonal membrane
C)Enlargements formed by a concentration of Schwann cells
D)Patches of blood vessels called the choroid plexus

Question

Quizplus · Accepted Answer

The nodes of Ranvier refer to the exposed, unmyelinated portions of the axonal membrane. They play a critical role in facilitating the propagation of action potentials along the axon. Option A is incorrect because neurotransmitter-storing vesicles are typically found in the axon terminals, not the nodes of Ranvier. Option C is incorrect because the enlargements formed by a concentration of Schwann cells refer to the myelin sheath, which covers the axon and is interrupted at the nodes of Ranvier. Option D is also incorrect because the choroid plexus refers to a patch of blood vessels in the brain that produces cerebrospinal fluid, which is not related to the nodes of Ranvier.

Which of the Following Is Most Descriptive of the Nodes