BIOM 2000 Chapter Notes - Chapter 2: Endoplasmic Reticulum, Skeletal Muscle, Myocyte

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The skeletal muscle forms the muscles attached to the skeleton, which move the limbs and other body parts. Its cells are long, striated and multinucleate, and they are subject to voluntary control. Connective tissue coverings (endomysium, perimysium and epimysium) enclose and protect the muscle fibers and increase the strength of skeletal muscles. Smooth muscle cells are uninucleate, spindle-shaped, and arranged in opposing layers in the walls of hollow organs. When they contract, substances (food, urine, a baby) are moved along internal pathways. Cardiac muscle cells are striated, branching cells that fit closely together and are arranged in spiral bundles in the heart. Their contraction pumped blood through the blood vessels. The sole function of muscle tissue is to contract or shorten. As it contracts, it causes movement, maintains posture, stabilizes joints and generates heat. The multinucleate cylindrical skeletal muscle fibers are packed with unique organelles called myofibrils.

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