BIOL273 Chapter Notes - Chapter 12: Intermediate Filament, Isotonic Contraction, Tetanus
5 Dec 2013
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Document Summary
Fibers are large, multinucleate cells: cardiac muscle: is found only in the heart and moves blood through the circulatory system. Fibers are striated, small, branched and uninucleate. Primary function is to influence the movement of material into, out of, and within the body. Lacks striated muscles: results from the less organized arrangement of contractile fiber. Skeletal muscles are composed of muscle fibers: a skeletal muscle is a collection of muscle cells, or muscle fibers. Long cylindrical cell with up to several hundred nuclei near the surface of the fiber. Are the largest cells in the body, created by the fusion of many individual embryonic muscle cells. Satellite cells: lie outside the muscle fiber membrane, activate and differentiate into muscle when needed for muscle growth and repair. Each skeletal muscle fiber is sheathed in connective tissue, with groups of adjacent muscle fibers bundled together into units called fascicles: muscle fiber anatomy. Sarcolemma: the cell membrane of a muscle fiber.
