How do action potentials in a myelinated axon differ from action potentials in an unmyelinated axon?
A) Action potentials are slower in myelinated axons because the myelin sheath interferes with the transfer of ions across the membrane.
B) Action potentials jump from node to node in myelinated axons rather than progressing down the entire length of the axon.
C) Action potentials have greater electrical charges in myelinated axons.
D) Action potentials in myelinated axons operate according to the all-or-none law, but action potentials in unmyelinated axons do not.

Question

Quizplus · Accepted Answer

Myelinated axons have nodes of Ranvier, which are gaps between segments of myelin. Action potentials travel rapidly down the myelinated axon, but "jump" from node to node (saltatory conduction) rather than propagating smoothly down the entire length of the axon as in unmyelinated axons.

How Do Action Potentials in a Myelinated Axon Differ from Action