A sign of aging of the muscular system is
A) expansion of muscle fiber diameters.
B) decreased supplies of myoglobin to muscles.
C) excess ATP.
D) increased creatine phosphate.

Question

Quizplus · Accepted Answer

Decreased supplies of myoglobin to muscles is a sign of aging of the muscular system. Myoglobin helps transport oxygen to muscle fibers, and decreased supplies can result in decreased muscle functioning and endurance. Expansion of muscle fiber diameters, excess ATP, and increased creatine phosphate are not necessarily signs of aging of the muscular system.

A Sign of Aging of the Muscular System Is