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

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Lysosomes are the organelles that break down protein in cells. During periods of prolonged inactivity, such as the three-month rest period after the college runner's injury, muscle protein is broken down by lysosomes, leading to a decrease in muscle size. The other organelles listed (peroxisomes, centrosomes, and ribosomes) are not directly involved in protein breakdown.

A Young Man Who Ran 6 Miles a Day Throughout