The most rapid conduction of an impulse along an axon occurs on a fiber that is
A)thick and myelinated.
B)thick and unmyelinated.
C)thin and myelinated.
D)thin and unmyelinated.

Question

The most rapid conduction of an impulse along an axon occurs on a fiber that is
A)thick and myelinated.
B)thick and unmyelinated.
C)thin and myelinated.
D)thin and unmyelinated.

Quizplus · Accepted Answer

The myelin sheath acts as an insulator and increases the speed of impulse conduction by allowing the action potential to jump from one node of Ranvier to the next (saltatory conduction). The diameter of the axon also affects the speed of impulse conduction, with larger axons conducting impulses faster than smaller axons. Therefore, a thick and myelinated axon will have the most rapid conduction of an impulse.

The Most Rapid Conduction of an Impulse Along an Axon