How do muscles help in your movement of your arm

1.	How do muscles help in your movement of your arm
Answer» Explanation: 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. Then, when the movement is completed, the flexor RELAXES and the EXTENSOR contracts to extend or straighten the limb at the same joint.

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