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Muscles are also necessary for movement: They're the masses of tough, elastic tissue that pull our bones when we move. Together, our bones, muscles, and joints — along with tendons, ligaments, and cartilage — form our musculoskeletal system and enable us to do everyday physical activities.

Skeletal muscles are attached to your bones by tissues called tendons. The tendons on the end of the muscle attach firmly to the bone. As the fibers in a muscle contract, they shorten and pull the ten- don. The tendon, in turn, pulls the bone and makes it move.

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