PHS 3507 Chapter Notes - Chapter 10: Myosin Head, Multinucleate, Glycolysis
25 Oct 2017
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Smooth muscle: move solids and fluids through the body. Produce skeletal movements: maintain posture and body position. Guard body entrances and exits: maintain body temperature. Connective tissue organization: all muscle connective tissues extend beyond the muscle to form: tendons (bundle) and aponeurosis (broad sheet) Contains collagen, elastic fibers, blood vessels and nerves. Extensive vascular network delivers o2 and nutrients and eliminates waste. Blood vessels and nerves branch from the perimysium into the endomysium. Nerves stimulate muscle contraction at the neuromuscular junction (nmj). Very large cells: 100cm2 diameter, 30 cm length: multinucleate (100"s of nuclei per cell) Unfused myoblasts are satellite cells (assist in muscle repair) Sarcoplasm (muscle cell cytoplasm: myofibrils (individual muscle fibers) Contraction is the result of myofibril shortning: myofilaments. Enlargement of the sr: major source of intracellular calcium. Represented by t tubules and adjacent terminal cistermae. 3 separate and distinct compartments: membranes tightly bound to each other.
