In a myelinated axon, ions can enter and leave the axonal membrane only at
A) the terminal buttons.
B) the soma.
C) the nodes of Ranvier.
D) the segment of membrane under the Schwann cell wrapping.
E) every point along the axonal membrane.

Question

Quizplus · Accepted Answer

In a myelinated axon, the ion channels are concentrated at the nodes of Ranvier. This allows for faster saltatory conduction of the action potential as it jumps from node to node. At the segments of membrane under the Schwann cell wrapping, the myelin provides insulation and prevents ion flow.

In a Myelinated Axon, Ions Can Enter and Leave the Axonal