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Skeletal muscle (striated)


Striated skeletal muscle tissue is the most abundant tissue in the body, comprising approximately 40 to 45% of the total body mass. (All the connective tissues combined are approximately as abundant, but no single form of connective tissue is more abundant than skeletal muscle tissue.) Skeletal muscle cells are long cylindrical cells having many nuclei. Individual muscle cells can attain lengths of up to 25 centimeters. Because of their shape, they are typically referred to as muscle fibers. The actin and myosin filaments in skeletal muscle fibers are arranged in an orderly fashion creating the appearance of alternating light and dark regions under a light microscope. Because of this feature, skeletal muscle tissue has a striped or striated appearance. Aggregates of skeletal muscle fibers are typically tied together and attach to the skeletal system by means of connective tissue. The part of the nervous system that supplies skeletal muscle is under conscious control, so skeletal muscle is often termed voluntary muscle because you have the ability to consciously regulate it.


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