ANAT 100 Chapter Notes - Chapter 10-11: Cardiac Muscle Cell, Endoplasmic Reticulum, Muscular System

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The muscular system is responsible for the movement of the human body. Attached to the bones of the skeletal system are about 700 named muscles that make up roughly half of a person"s body weight. Each of these muscles is a discrete organ constructed of skeletal muscle tissue, blood vessels, tendons, and nerves. Muscle tissue is also found inside of the heart, digestive organs, and blood vessels. In these organs, muscles serve to move substances throughout the body. Morphological characterization: striated: due to overlapping pattern of parallel thick and thin contractile protein filaments. Skeletal: composed of cylindrical muscle cells called muscle fibers - multinucleated. Cardiac: in thick middle layer of heart wall - myocardium; resemble skeletal muscle however: Only contains one or two centrally located nuclei. Connected by intercalated disks which have strong desmosomes and gap junctions allowing rapid transport of an electrical stimulus: smooth (aka visceral): lacks striations seen in other two types - cells appear smooth.

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