A young man who ran 6 miles a day throughout high school is injured during his first season running cross country in college. He must rest for three months and then gradually begin exercising again. The skeletal muscles in his lower limbs decrease in size during this prolonged period of inactivity. The organelles that break down his muscle proteins are

A. ribosomes.
B. centrosomes.
C. peroxisomes.
D. lysosomes.


Answer: D

Anatomy & Physiology

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