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Sliding Filament Theory and Major Muscles of the Human Body

Sliding Filament Theory and Major Muscles of the Human Body. Lesson. Skeletal Muscle. Human body contains over 400 skeletal muscles 40-50% of total body weight Functions of skeletal muscle Force production for locomotion and breathing Force production for postural support

daniel-mullen
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Sliding Filament Theory and Major Muscles of the Human Body

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  1. Sliding Filament Theoryand Major Muscles of the Human Body Lesson

  2. Skeletal Muscle • Human body contains over 400 skeletal muscles • 40-50% of total body weight • Functions of skeletal muscle • Force production for locomotion and breathing • Force production for postural support • Heat production during cold stress

  3. Structure of Skeletal Muscle:Connective Tissue Covering • Epimysium • Surrounds entire muscle • Perimysium • Surrounds bundles of muscle fibers • Fascicles • Endomysium • Surrounds individual muscle fibers

  4. Structure of Skeletal Muscle:Microstructure • Sarcolemma • Muscle cell membrane • Myofibrils • Threadlike strands within muscle fibers • Actin (thin filament) • Troponin • Tropomyosin • Myosin (thick filament)

  5. Structure of Skeletal Muscle:The Sarcomere • Further divisions of myofibrils • Z-line • A-band • I-band • Within the sarcoplasm • Sarcoplasmic reticulum • Storage sites for calcium

  6. Muscular Contraction • The sliding filament model • Muscle shortening occurs due to the movement of the actin filament over the myosin filament • Formation of cross-bridges between actin and myosin filaments • Reduction in the distance between Z-lines of the sarcomere

  7. The Sliding Filament Model of Muscle Contraction

  8. Cross-Bridge Formation in Muscle Contraction

  9. Sliding Filament Theory • Rest – uncharged ATP cross-bridge complex • Excitation-coupling – charged ATP cross-bridge complex, “turned on” • Contraction – actomyosin – ATP > ADP & Pi + energy • Recharging – reload cross-bridge with ATP • Relaxation – cross-bridges “turned off”

  10. http://www.youtube.com/watch?v=0kFmbrRJq4w&feature=related

  11. Muscles Origins and Insertions

  12. Muscles from pg. 46 in text

  13. Neck Muscles

  14. Muscles of Vertebral Column

  15. Back Muscles Longissiumus Iliocostalis Spinalis

  16. Thoracic Cage Muscles

  17. Thoracic Cage

  18. Abdominal Muscles

  19. Abdominals

  20. Moving Upper Limb

  21. Rotator Cuff

  22. Scapular Muscles

  23. Scapular Muscles cont.

  24. Muscles that move Humerus

  25. Elbow Flexors & Extensors

  26. Supination and Pronation of the Forearm

  27. Extrinsic Hand Muscles

  28. Pelvic Muscles

  29. Gluteus Max, Med, Min

  30. Hip Adductors

  31. Hip Muscles

  32. Quadriceps

  33. Quadriceps

  34. Hamstrings

  35. Hamstrings

  36. Lower Leg

  37. Lower Leg Muscles

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