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Consists predominantly of contractile cells and produces the movements of various parts of the body by contraction.
Occurs in three types: skeletal, cardiac and smooth
Skeletal Muscle
Is voluntary and striated; makes up about 40% of the total body mass; and functions to produce movement of the body, generate body heat, and maintain body posture.
Has two attachments, an origin (which is usually the more fixed and proximal attachment), and an insertion (which is the more movable and distal attachment).
Is enclosed by epimysium , a thin layer of connective tissue. Smaller bundles of muscle fibers are surrounded by perimysium. Each muscle fiber is enclosed by endomysium.
Cardiac Muscle
Is involuntary and striated and forms the myocardium , the middle layer of the heart.
Is innervated by the autonomic nervous system but contracts spontaneously without any nerve supply.
Includes specialized myocardial fibers that form the cardiac conducting system.
Smooth Muscle
Is involuntary and nonstriated, and generally arranged in two layers, circular and longitudinal , in the walls of many visceral organs.
Is innervated by the autonomic nervous system, regulating the size of the lumen of a tubular structure.
Undergoes rhythmic contractions called peristaltic waves in the walls of the gastrointestinal (GI) tract, uterine tubes, ureters, and other organs.