When a muscle undergoes atrophy in response to disuse
A)motor neurons grow and invade abnormally.
B)the size of actin and myosin filaments decreases.
C)capillaries and vessels rupture.
D)the muscle swells.

Question

Quizplus · Accepted Answer

Atrophy in response to disuse is a decrease in muscle size due to a decrease in muscle activity. This decrease in muscle activity leads to a decrease in the size of actin and myosin filaments and a loss in muscle protein content. It does not cause motor neurons to grow abnormally, capillaries and vessels to rupture, or the muscle to swell.

When a Muscle Undergoes Atrophy in Response to Disuse