Question

Skeletal muscles are arranged in antagonistic pairs. What does this mean and what is an example?

A. There are always paired tendons and ligaments; the hip joint.
B. When one sarcomere contracts, the neighboring one relaxes; triceps and biceps.
C. One is under conscious control and one is not; the diaphragm and ribs.
D. There is always paired cartilage and muscle tissue; the knee joint.
E. When one contracts, the other relaxes and this allows the bones to move; triceps and biceps.

Answer 1

Answer: E. When one contracts, the other relaxes and this allows the bones to move; triceps and biceps.

Step-by-step explanation:

Antagonistic action occurs between the two pairs of muscles. In this action one muscle while contracts other muscle relaxes. The example of antagonistic pair is of biceps and triceps. The triceps remain in the relax phase while the biceps contracts so as to lift the arm.