PHGY 210 Chapter Notes - Chapter 5: Cardiac Muscle, Smooth Muscle Tissue, Myofibril

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Muscles: skeletal muscle makes up about 40% of body weight in men and 32% in women, smooth and cardiac muscle make up about 10% of body weight, muscles are categorized as either, striated (cardiac or skeletal muscle) or unstriated (smooth muscle, voluntary innervated by the somatic nervous system and subject to voluntary control (skeletal) or involuntary inmverated by the autonomic nervous system and not subject to voluntary control (cardiac or smooth) Whole muscle > muscle fibre > myofibril > thick and thin filaments > myosin and actin: dense connective tissues cover the muscle to provide structure, epimysium covers the whole muscle, perimysium divides the muscle fibres into bundles or fascicles, endomysium is the innermost connective tissue and covers each muscle fibre or cell, a myofibril displays two bands, dark (a) bands: made of a stacked set of thick filaments along with portions of the thin filaments the overlap on both ends of the thick filaments.

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