The speed of impulse conduction along an axon may be increased by
A) myelin sheaths.
B) graded potentials.
C) neurotransmitters.
D) effector cells.

Question

Quizplus · Accepted Answer

Myelin sheaths increase the speed of impulse conduction along an axon by allowing the action potential to "jump" from one node of Ranvier to the next, rather than traveling along the entire length of the axon. This is known as saltatory conduction and results in a faster and more efficient propagation of the signal. Graded potentials, neurotransmitters, and effector cells do not directly affect the speed of impulse conduction along an axon.

The Speed of Impulse Conduction Along an Axon May Be