Action potentials move along axons
A)more slowly in axons of large diameter as compared to those 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 nonmyelinated axons.
E)by reversing the concentration gradients for sodium and potassium ions.

Question

Quizplus · Accepted Answer

Myelinated axons have a higher conduction velocity of action potentials due to the presence of myelin sheaths that insulate the axonal membrane and force the action potential to jump between nodes of Ranvier, rather than propagate continuously along the length of the axon. This is called saltatory conduction and is a much faster method of transmitting action potentials. The other options are not accurate descriptions of how action potentials move along axons.

Action Potentials Move Along Axons