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Anonymous
ANSWERS: 1
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this is a really simplified version, but in general you have a pair of muscles for each movement you can make. both muscles move by contracting. When one of the muscles contracts, it moves you one way. When the other muscle contracts, it moves you the other way. Obviously, in many cases you actually have a lot more muscles working in a lot of different combinations. But the basic way they move you is always by the muscle contracting and releasing.
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