BIOLOGY 173 Lecture Notes - Lecture 25: Endoplasmic Reticulum, Skeletal Muscle, Sarcomere

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Consists of: sarcomeres (z line to z line) Actin two strands of pearls (globular proteins) wrapped around each other. Tropomyosin ribbon like protein (thin) lies in groove of actin strand. Troponin globular protein sits on tropomyosin. Bundles of individual myosin molecules form thick filaments. Contracted z lines pulled to center of sarcomere; thin filaments slide to center. A band remains the same length. Principles governing the contraction of skeletal muscle cells. Muscle cell, contracts and pulls on connective tissue elements and the pull exerted on the tendon attached to the bone. Pull is called tension and if the tension is greater than the weight of the bone then movement occurs. \ Skeletal muscle cells only contract if stimulated buy a nerve. Motor unit concept: motor neuron and all muscle cells that it stimulates. Physiology of muscle contraction: control by the nervous system.

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