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How muscles work

Movement occurs when signals from the nervous system cause muscles to contract. Conscious movements of the body are produced by the Interaction of skeletal muscles, bones, and joints. Most muscles connect one bone to another and cross a joint. When a muscle contracts, It pulls on the bones to move them. Many muscles are found In pairs, one on each side of a joint, and produce opposing movements. For example, In the upper arm the triceps contracts to pull the arm straight and the biceps contracts to bend the arm.

Triceps contracts Biceps relaxes

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