Where can sodium ions enter a myelinated axon?
A)At the soma
B)Through the myelin sheath
C)At the nodes of Ranvier
D)At the point at which the axon divides and branches

Question

Quizplus · Accepted Answer

Sodium ions can only enter a myelinated axon at the nodes of Ranvier, which are the gaps in the myelin sheath. This is where the axon is exposed and where the action potential can be generated. Sodium ions cannot enter through the myelin sheath, at the soma, or at the point where the axon divides and branches.

Where Can Sodium Ions Enter a Myelinated Axon