Muscle Tissue - Skeletal muscle fibers Sarcolemma (cell...

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Muscle Tissue Skeletal muscle tissue and the Muscular System Three types of muscle • Skeletal – attached to bone • Cardiac – found in the heart • Smooth – lines hollow organs Skeletal muscle functions • Produce skeletal movement • Maintain posture and body position • Support soft tissues • Guard entrances and exits • Maintain body temperature Anatomy of Skeletal Muscle Organization of connective tissues • Epimysium surrounds muscle • Perimysium sheathes bundles of muscle fibers • Epimysium and perimysium contain blood vessels and nerves • Endomysium covers individual muscle fibers • Tendons or aponeuroses attach muscle to bone or muscle
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Unformatted text preview: Skeletal muscle fibers Sarcolemma (cell membrane) Sarcoplasm (muscle cell cytoplasm) Sarcoplasmic reticulum (modified ER) T-tubules and myofibrils aid in contraction Sarcomeres regular arrangement of myofibrils Myofibrils Thick and thin filaments Organized regularly Muscle Fiber Thin filaments F-actin Nebulin Tropomyosin Covers active sites on G-actin Troponin Binds to G-actin and holds tropomyosin in place Thick filaments Bundles of myosin fibers around titan core Myosin molecules have elongate tail, globular head Heads form cross-bridges during contraction Interactions between G-actin and myosin prevented by tropomyosin during rest...
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This note was uploaded on 11/22/2011 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Muscle Tissue - Skeletal muscle fibers Sarcolemma (cell...

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