★ Skeleton and Muscles Quiz
what kind of system involves all the bones of the body?
A. circulatory system
B. respiratory system
C. skeletal system
D. support system
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What happens to biceps and triceps when you straighten 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
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