हाउ डू द मसल्स ए टेक्स्ट टू बोंस ब्रिंग अबाउट मूवमेंट
plss... give an english answer
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Answer:
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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