. How do the muscles help to move the bones?
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6
Explanation:
Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
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4
Explanation:
Skeletal muscles that are attached to the bones of your skeleton and provide force that moves your bones. They can contract and relax. When a muscle contracts it shortens and pulls on the bone.
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