antoniobillingsley0 antoniobillingsley0

14-02-2022
Health

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What makes your bones move up and down?

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Аноним Аноним

14-02-2022

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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