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Muscles pull. They have the capability of either contracting, or relaxing. They get longer when they relax but they do not exert any force by getting longer, since they are very flexible objects, not stiff rods. They only exert force when they contract, and the force they exert can be described as pulling. Muscles work in pairs, so that a joint can both bend and unbend, depending upon which muscle is pulling on it.

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12y ago

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