A subject, with eyes closed, repeatedly contracts a muscle until fatigue occurs. When the eyes are opened, tension is restored. This experiment is a demonstration of fatigue being related to which of the following sites?
A) muscle
B) central nervous system
C) mitochondria
D) peripheral nervous system

Question

Quizplus · Accepted Answer

The fact that tension is restored when the eyes are opened suggests that the fatigue is not due to a problem with the muscle or mitochondria, but rather is centrally mediated. Therefore, the best choice is B, central nervous system.

A Subject, with Eyes Closed, Repeatedly Contracts a Muscle Until