Question

19
the most rapid conduction of an impulse along an axon occurs on a fiber that is

thin and unmyelinated

thick and unmyelinated

thick and myelinated

thin and myelinated

Explanation:

Myelin sheath acts as an insulator, speeding up impulse conduction (saltatory conduction). Thicker fibers have less resistance to ion flow. So, thick myelinated fibers allow fastest impulse conduction.

Answer:

thick and myelinated