The contraction of a muscle exerts a pull on a bone because muscles attach to bones by

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Muscles attach to bones by tendons, which are strong, fibrous cords. When a muscle contracts, the tendon pulls on the bone, causing movement. Ligaments connect bone to bone, bursae are fluid-filled sacs that cushion and reduce friction between tendons and bone, fasciae are connective tissue that surround and separate muscles, and myofibrils are the contractile units within muscle fibers.

The Contraction of a Muscle Exerts a Pull on a Bone