Action Potentials Move Along Axons

Question

Action potentials move along axons
A)more slowly in axons of large than of small diameter.
B)by the direct action of acetylcholine on the axonal membrane.
C)by activating the sodium-potassium "pump" at each point along the axonal membrane.
D)more rapidly in myelinated than in non-myelinated axons.
E)by reversing the concentration gradients for sodium and potassium ions.

Accepted Answer

Myelinated axons have nodes of Ranvier where action potentials can "jump" from one node to another, allowing for faster propagation of the signal. Non-myelinated axons must rely on continuous propagation, which is slower. Therefore, action potentials move more rapidly in myelinated than in non-myelinated axons.