The conduction velocity is fastest in
A) Small diameter myelinated axons
B) Small diameter unmyelinated axons
C) Small diameter axons with large internodal distances
D) Large diameter myelinated axons
E) Large diameter unmyelinated axons

Question

Quizplus · Accepted Answer

The conduction velocity of nerve impulses is fastest in large diameter myelinated axons. This is because myelination reduces electrical capacitance and increases electrical resistance across the axonal membrane, allowing for faster propagation of action potentials. Additionally, larger diameters reduce the internal resistance to the flow of ions within the axon, further increasing conduction velocity.

The Conduction Velocity Is Fastest in