BPK 142 Lecture Notes - Lecture 4: Motor Unit, Microstructure, Sartorius Muscle

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Muscle cells (fibers) are the only cells in the body that have the property of contractility, which allows them to shorten and develop tension. There are three types of muscle tissue: skeletal muscle - attaches to and moves the skeleton. The contractile molecules are very organized giving skeletal muscle a striated pattern, hence the name, striated muscle . Skeletal muscle comprises about 36 percent of the total body weight in women and 42 percent in men. 75 percent of skeletal muscle is water, 20 percent is protein, and the remainder consists of inorganic salts, pigments, fats, and carbohydrates: smooth muscle - found in the walls of hollow organs and blood vessels. The contractile molecules are not aligned in a set pattern like skeletal muscle, hence the name smooth muscle. This muscle is under involuntary control: cardiac muscle - the contractile tissue of the heart wall. This muscle has characteristics of both smooth muscle and skeletal muscle.

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