Myelinated axons have the conduction velocity of much larger axons (unmyelinated of course)because of all the following reasons,except:
A)voltage channels are only present at the nodes of Ranvier.
B)saltatory conduction.
C)more ion channels are present in myelinated axons.
D)insulation.

Question

Quizplus · Accepted Answer

One of the reasons for the fast conduction velocity of myelinated axons is saltatory conduction, in which the action potential jumps from one node of Ranvier to another, without depolarizing the myelinated segment in between. Insulation also contributes to the rapid conduction by preventing the leakage of ions out of the axon. And voltage channels are indeed concentrated at the nodes of Ranvier, allowing for efficient depolarization of the adjacent myelinated segment. The only option that does not contribute to the fast conduction velocity is the presence of more ion channels in myelinated axons, as this is not true - in fact, myelinated axons have fewer ion channels overall than unmyelinated axons.

Myelinated Axons Have the Conduction Velocity of Much Larger Axons