When a muscle is stimulated prior to full relaxation of a previous contraction and the second stimulus is added to the first contraction, this phenomenon is referred to as ________.
A) tetanus
B) twitch
C) fatigue
D) summation

Question

Quizplus · Accepted Answer

This phenomenon is referred to as summation, where the muscle fiber does not have enough time to fully relax before the next stimulus is added, resulting in a stronger contraction. Tetanus refers to a sustained contraction, twitch refers to a single contraction, and fatigue refers to a decrease in muscle power due to prolonged exertion.

When a Muscle Is Stimulated Prior to Full Relaxation of a Previous