During a(n) _____ muscle action, tension is produced without movement at the joint or shortening of the muscle fibers.
A) isometric
B) isotonic
C) eccentric
D) concentric

Question

Quizplus · Accepted Answer

Isometric muscle actions occur when tension is produced by the muscle without movement at the joint or shortening of the muscle fibers. The muscle length remains the same during an isometric contraction. This is in contrast to isotonic muscle actions where movement occurs and the muscle fibers shorten or lengthen. Eccentric and concentric muscle actions both involve isotonic contractions where movement occurs, but the direction of the movement differs. Eccentric contractions occur when the muscle fibers are lengthening, while concentric contractions involve shortening of the muscle fibers.

During A(n) _____ Muscle Action, Tension Is Produced Without Movement