Topics: Skeleton and Muscles Quiz
What is the function of the bone marrow?
A. To make protein
B. To make red blood cells and white blood cells
C. reduce friction
D. to hold bones together
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What happens to biceps and triceps when you bend your arm?
A. The biceps muscle is contracted and the triceps muscle is relaxed
B. The biceps muscle is relaxed and the triceps muscle is contracted
C. Both biceps and triceps are contracted
D. Both biceps and triceps are relaxed