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IMG_NEW_0054 - wall. This muscle has characteristics of...

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SKELETAL MUSCLE - STRUCTURE AND FUNCTION 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: 1. Skeletal musclq. - attaches to and moves the skeleton. The contractile molecules are very organized giving skeletal muscle a striated pattern, hence the name, "striated muscle". .qU:"del yglgltary*gg3trol. Skeletal muscle comprises dbout 36aA of the total body weight in women and 42 Yo in men. 75 percent of skeletal muscle is water, 20 %o is protein, and the remainder consists of inorganic salts, pigments, fats, and carbohydrates. 2. Smooth muscle -'found in the walls of hollow organs and blood vessels. The contractile molecules are not aligned in a set pattem like skeletal muscle, hence the name smooth muscle. This muscle is under involuntary control. 3. Cardiac muscle - the contractile tissue of the heart
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Unformatted text preview: wall. This muscle has characteristics of both smooth muscle and skeletal muscle. The contractile molecules arc organized very much like skeletal muscle. Like smooth muscle, it is also under involuntarv control. I. Overview of Skeletal Muscle A. Criteria Used To Name Muscles 1. Shape - deltoid (triangular), trapezius, rhomboid, latissimus (wide) 2. Action - various muscle names include the terms flexor, extensor, adductor, or pronator. 3. Location - tibialis anterior, intercostals, pectoralis major 4. Divisions - triceps brachii, quadriceps femoris 5. Size relationships - gluteus maximus, gluteus medius, gluteus minimus. Several names include the terms "brevis" (short), and "longus" (long). 6. Direction of fibers - transversus (across), rectus (straight) B. Skeletal Muscle Shapes A fascicle is a bundle of muscle fibres that arc encased by perimysium....
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