Muscle atrophy that progresses with aging is caused by reduction in
A)muscle strength, but not motor neuron activity.
B)motor neuron activity, but not muscle strength.
C)connective tissues.
D)the sizes of muscle fibers.

Question

Muscle atrophy that progresses with aging is caused by reduction in 
A)muscle strength, but not motor neuron activity.
B)motor neuron activity, but not muscle strength.
C)connective tissues.
D)the sizes of muscle fibers.

Quizplus · Accepted Answer

Muscle atrophy that progresses with aging is caused by the reduction in the sizes of muscle fibers. The reduction in muscle mass occurs due to the loss of muscle fibers or reduction in the size of individual muscle fibers. This reduction in muscle size results in decreased muscle strength and increased susceptibility to injury.

Muscle Atrophy That Progresses with Aging Is Caused by Reduction