HSC 215 Lecture Notes - Lecture 8: Tetanus, Too Short, Multinucleate
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Last question for exam 3- answer is a. 3 types of muscle tissue: skeletal: striated & voluntary, smooth: non-striated & involuntary, cardiac: striated & involuntary. Structure of skeletal muscle: gross: review oyo from anatomy. Muscle consists a number of muscle fibers lying parallel to one another and held together by connective tissue. Ends of segments expand to form saclike regions terminal cisternae/lateral sacs. Ap on surface membrane spreads down into t-tubule. Viewed microscopically myofibril displays alternating dark (the a bands) and light bands (the i bands) giving appearance of striations. Found between two z-lines connects thin filaments of two adjoining sarcomeres) Proteins in muscle: contractile myofilaments, regulatory t & t, structural titan, a closer look at the myofilaments: Tails oriented toward center of filament and globular heads protrude outward at regular intervals. Heads form cross-bridges between thick and thin filaments: cross bridge head has two important sites critical to contractile process. Atpase of myosin: enzyme that breaks down atp: actin:
