Kinesiology 2241A/B Lecture Notes - Lecture 5: Myocyte, Aponeurosis, 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/lengthen. Its attachments and orientation determine what moves and how. Note: different shapes and wrappings of the muscles, different alignment of the fibers within the muscles, the size of the tendon attachments at either end. Muscles can only do 1 thing so to do multiple things, need different muscles in different directions. More muscles in a region = more movement and mobility. Origin: the proximal attachment of a muscle. Each muscle is a coil on a coil on a coil. Fascicles: covered by perimysium: muscle fibers: covered by endomysium. Individual muscle cell: myofibrils make up a muscle fiber/cell. If were to snap a muscle it would be around midsection of a tendon, not at musculotendinous junction (very strong) Hundreds of sarcomere connect in a long chain (in parallel) to form a myofibril.

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