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It is striated (alternating with light and dark bands, called striations) and is attached to bones. A single skeletal muscle fiber is very long and has many nuclei, located at the periphery of the cell. Individual muscle fibers are parallel to each other.Smooth muscle tissue is found in the walls of hollow internal organs and blood vessels. The diaphragm is a skeletal muscle that separates the thoracic and abdominopelvic cavities. It is innervated by the phrenic nerve. The diaphragm is the main muscle of re â¦ spiration, with diaphragmatic contraction responsible for 75% of the air movement in a normal breath at rest.
Skeletal muscle is composed of large, cylindrical, multinucleated cells. The most striking feature of skeletal muscle fibers is the presence of striations that are conspicuous in longitudinally sectioned fibers.The striations are due to the presence of myofibrils, which are cylindrical bundles of thick and thin myofilaments, organized into units of contraction called sarcomeres.he most striking feature of skeletal muscle fibers is the presence of striations that are conspicuous in longitudinally sectioned fibers. The striations are due to the presence of myofibrils, which are cylindrical bundles of thick and thin myofilaments, organized into units of contraction called sarcomeres.