Which of the following is not a reason muscular weakness tends to develop in old age?
A) Aged muscle has less glycogen, myoglobin, and creatine phosphate.
B) There are fewer motor neurons in the spinal cord.
C) Aged muscle fibers have fewer myofibrils.
D) There are fewer and smaller mitochondria in aged muscle.
E) The muscle fibers of aged muscle no longer synthesize myosin.

Question

Quizplus · Accepted Answer

Muscle fibers in aged muscle can still synthesize myosin, although the efficiency and rate might decrease with age. The other options (A, B, C, D) are valid reasons for the development of muscular weakness in old age, including changes in muscle composition, reduction in motor neurons, and alterations in cellular structures.

Which of the Following Is Not a Reason Muscular Weakness