Which of the Following is True of Myelination

Question

Which of the following is true of myelination?
A) Occurs only at the nodes of Ranvier
B) Increases the speed of the action potential along the axon
C) Is responsible for the gray appearance of gray matter
D) Increases the synthesis of neurotransmitters

Accepted Answer

Myelination increases the speed of the action potential along the axon by allowing for saltatory conduction, which means that the action potential can jump from one node of Ranvier to the next, rather than traveling the entire length of the axon. Myelination also contributes to the white appearance of white matter in the brain, as opposed to the gray appearance of gray matter. Myelination does not affect neurotransmitter synthesis.