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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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