Which of the following statements concerning the rate of action potential propagation is true?
A)It is faster in large-diameter axons than in small-diameter ones
B)It is faster for a strong stimulus than for a weak one
C)It is faster in myelinated nerve fibers than in nonmyelinated ones
D)Both it is faster in large-diameter axons than in small-diameter ones and it is faster in myelinated nerve fibers than in nonmyelinated ones are true
E)All of the choices are true

Question

Quizplus · Accepted Answer

Action potential propagation is faster in large-diameter axons than in small-diameter ones because larger axons have less resistance to current flow. Action potential propagation is also faster in myelinated nerve fibers than in nonmyelinated ones because the myelin sheath acts as an insulator and allows the action potential to jump from one node of Ranvier to the next, increasing the speed of propagation. A strong stimulus may result in the recruitment of more neurons to fire, but it does not directly affect the rate of action potential propagation. Therefore, B is false. Choice E is incorrect because B is false.

Which of the Following Statements Concerning the Rate of Action