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Musclular System shayne soto p.4 (Physiology of muscle contraction (After…

- - - - Specialized muscle of the heart. Cardiac muscle tissue occurs only in the heart, where it constitutes the bulk of the heart walls. Like skeletal muscle cells, cardiac muscle cells are striated, but cardiac muscle is not voluntary.
    - - Skeletal muscle tissue is packaged into the skeletal muscles, organs that attach to and cover the skeleton. Skeletal muscle fibers are the longest muscle cells and have obvious stripes called striations. Although it is often activated by reflexes, skeletal muscle is called voluntary muscle because it is the only type subject to conscious control.
    - - Smooth muscle tissue is found in the walls of hollow visceral organs, such as the stomach, urinary bladder, and respiratory passages. Its role is to force fluids and other substances through internal body channels. Like skeletal muscle, smooth muscle consists of elongated cells, but smooth muscle has no striations. Like cardiac muscle, smooth muscle is not subject to voluntary control. Its contractions are slow and sustained.