The tendon of the supraspinatus muscle most frequently tears in a baseball pitcher who injures one of his sit muscles.
The stiff, substantial strip of fibrous tissue known as a tendon joins a muscle to a bone. Collagen fibers make up the tendon tissue. Its purpose is to transfer to bone the force produced by muscle contraction. Tendons can stretch and recoil without rupturing, making them robust, resilient, and flexible. Because of their flexibility, tendons help reduce energy expenditure during locomotion and other activities by absorbing a large portion of the force produced by muscle contractions.
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