Muscular System - Mrs. Hoffert's Anatomy Class

Muscular System - Mrs. Hoffert's Anatomy Class

ARRANGEMENT OF A MUSCLE Muscle Fascicle Muscle Fiber (cell) Myofibril Myofilaments (thick/thin) MUSCLE FIBER [CELL] STRUCTURE up to .5 meter long yet only .1 mm in thickness multinucleated

Sarcolemma (several nuclei) the membrane around a muscle fiber Sarcoplasm the cytoplasm of a muscle cell Myofibril parallel cords of protein, several make up a

muscle fiber Sarcoplasmic Reticulum Lattice-like network surrounding each myofibril [ Ca+ storage] Cisterns larger tubules of the sarcoplasmic reticulum; 2 cisternae, along with a Transverse (T) Tubule form what is known as the triad T-Tubule has openings that lead in from the sarcolemma surface

MYOFIBRIL Parallel cords of protein, several make up a muscle fiber COMPOSITION OF A MYOFIBRIL 2 Types of Myofilaments:

MYOSIN- thick filament protein ACTIN- thin filament /3 proteins [actin, troponin and tropomyosin] SARCOMERE: structural and functional unit of the myofibril/ contractile unit of skeletal muscle Composed of Actin and Myosin

Located between 2 Z Lines PARTS OF THE SARCOMERE A-Band where myosin and actin

overlap I-Band only actin filaments Z-line perpendicular strands of protein fibers extend out from actin filaments H-Zone center of A-Band, myosin filaments, w/ no overlapping actin

filaments M-Line center of H-Zone, proteins that attach to the center of the myosin filaments, holding them in place

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