★ Excretory and Musculoskeletal System Quiz
Which of the following is an example of voluntary muscle action?
A. pupils dilating in reaction to light
B. the heart pumping blood through the body
C. fingers typing on a keyboard
D. the stomach moving food to the intestines.
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How many muscles are there in the body?
A. about 63
B. about 36
C. about 630
D. about 360
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