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1.when you exercise vigorously,glycogen is broken down in muscle cells, providing energy to ----
a. the entire body
b. the heart and muscle cells
c. the parts being exercised
d. muscle cells
2. which one of the following participate in the body's second line of defense ?
a. tissue linings of the respiratory system
c. skin cells
3. what does cholesterol do ?
a. it makes steroids
b. it provides crucial amino acids
c. it reduces the chances of developing atherosclerosis
d. it reduces dependency on saturated fats
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