Which statement is true regarding action potential propagation?
A) In salutatory conduction, the myelin is composed of fat, which insulates the axon membrane against sodium ion flow across the membrane.
B) Continuous propagation results in one graded potential producing multiple action potentials.
C) The action potential will die out along the axon if another graded potential does not occur.
D) All voltage-gated channels along the axon open at the same time, allowing sodium to flow in simultaneously.
E) The active transport of sodium and potassium through sodium-potassium ion pumps causes depolarization of the axon membrane.

Question

Quizplus · Accepted Answer

In salutatory conduction, the myelin sheath insulates the axon membrane and speeds up action potential propagation by allowing the action potential to "jump" between nodes of Ranvier. The myelin is composed of fat and acts as an insulator, preventing sodium ion flow across the membrane except at the nodes, where the axon membrane is exposed.

Which Statement Is True Regarding Action Potential Propagation