In what regions is the surface of the axon exposed to the extracellular fluid?
A) ion channels
B) nodes of Ranvier
C) refractory
D) axon Hillock

Question

Quizplus · Accepted Answer

The nodes of Ranvier are the gaps in the myelin sheath along the axon where the surface of the axon is exposed to the extracellular fluid. This allows for more efficient propagation of action potentials along the axon. Ion channels are present throughout the membrane of the axon, not just in regions exposed to extracellular fluid. Refractory refers to a period of time after an action potential where the axon is temporarily incapable of firing again. The axon hillock is the region of the axon closest to the cell body where action potentials are usually initiated.

In What Regions Is the Surface of the Axon Exposed