Kinesiology 2241A/B Lecture Notes - Lecture 6: Myocyte, Sarcomere, Myofibril

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The muscles overlay the skeleton and provide the means to move it. Each muscle produces a motion when it creates tension and tries to shorten. Its attachments and orientation determine what moves and how. If external loading is equal to muscle its equal, if the external load is greater than the tension produce the muscle to lengthen and vice versa. Note the different shapes and wrappings of the muscles. Note the different alignment of the fibers within the muscles. Note the size (large or small) of the tendon attachments at either end. The proximal attachment of a muscle is its origin. The distal attachment of a muscle is its insertion. Muscle often have wrapping points or retinacula for redirecting muscle pull between the origin and insertion. Muscles attached to bone via tendon or (cid:3243)aponeuroses(cid:3244) wide bands of connective tissue. It"s the wrapping point that determines position of the muscle. Each muscle is a coil on a coil on a coil.

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