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Muscle Cell Types - walls of the digestive tract bladder...

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Muscle Cell Types There are three types of muscle tissue : . 1. skeletal (or voluntary/striated) muscle, the most abundant tissue in the human body, producing movement. Each skeletal- muscle fiber is roughly cylindrical, contains many nuclei, and is crossed by alternating light and dark bands called striations . Fibers bind together, via connective tissue , into bundles; and these bundles, in turn, bind together to form muscles. Thus, skeletal muscles are composite structures composed of many muscle fibers, nerves, blood vessels, and connective tissue. Skeletal muscles are controlled by the somatic nervous system (SNS). 2. smooth (or visceral) muscle, forming the muscle layers in the
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Unformatted text preview: walls of the digestive tract, bladder, various ducts, arteries and veins, and other internal organs. Smooth- muscle cells are elongated and thin, not striated, have only one nucleus, and interlace to form sheets rather than bundles of muscles. Smooth muscle is controlled by the autonomic nervous system (ANS). 3. cardiac (or heart) muscle, a cross between the smooth and striated muscles, comprising the heart tissue. Like smooth muscle, it is innervated by the autonomic nervous system (ANS). Each of more than 600 muscles is served by nerves which link the muscle to the brain and spinal cord . Skeletal muscle Smooth muscle Cardiac muscle...
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