LING 2P90 Lecture Notes - Myocyte, Mechanical Advantage, Myosin
24 Nov 2012
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Epimysium (muscle belly- composed of several fascicles) Bundles of muscle fibers from fascicle (muscle fibers) 100s or 1000s myofibrils combine to form a single muscle fiber (myofibrils) Actin and myosin filaments from light and dark bands (actin filaments & Muscle actin moves/slides (sliding muscle filament theory) closer to myosin; this occurs when the muscle contracts. When muscles contract you have a decreased distance between the origin and the insertion. One attachment is moving towards the other attachment which means. Flexion or flex means to bend: also meaning that the one part of the joint is moving farther away from the other part of the body. Muscle attachements: origin, by convention, attachment where little movement is taking place. Insertion: by convention, attachment being acted upon. Muscle action: contraction decreases the distance between origin and insertion, muscles pull, they never push, muscles and joints together form lever system.
