Which of the following is not a reason muscular weakness tends to develop in old age?

A. There are fewer and smaller mitochondria in aged muscle.
B. Aged muscle has less glycogen, myoglobin, and creatine phosphate.
C. The muscle fibers of aged muscle no longer synthesize myosin.
D. Aged muscle fibers have fewer myofibrils.
E. There are fewer motor neurons in the spinal cord.


Answer: C

Anatomy & Physiology

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