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Ch1 (3 18)

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Ch1 (3 18)

  1. 1. 1 C H A P T E R Muscle Physiology Gary R. Hunter
  2. 2. Chapter Outline  Skeletal muscle macrostructure and microstructure  Sliding-filament theory of muscular contraction  Fiber types  Types of muscle action  Force production
  3. 3. Three Types of Connective Tissue: Epimysium, Perimysium, and Endomysium
  4. 4. A Motor Unit
  5. 5. Sectional View of a Muscle Fiber
  6. 6. Detailed View of Myosin and Actin Protein Filaments in Muscle
  7. 7. T he discharge of an action potential from a motor nerve signals the release of calcium from the sarcoplasmic reticulum into the myofibril, causing tension development in muscle. 
  8. 8. Contraction of a Myofibril: Stretched Muscle
  9. 9. Contraction of a Myofibril: Partially Contracted Muscle
  10. 10. Contraction of a Myofibril: Completely Contracted Muscle
  11. 11. C alcium and ATP are necessary for myosin cross-bridge cycling with actin filaments. 
  12. 12. T ype II, or fast-twitch, muscle fibers are capable of developing higher forces than Type I, or slow-twitch, muscle fibers— especially at higher velocities of muscle action. 
  13. 13. T he number of cross-bridges that are attached to actin filaments at any instant in time dictates the force production of a muscle. 
  14. 14. Force-Velocity Curve for Eccentric and Concentric Actions
  15. 15. Three Arrangements of Muscle Fibers Fibers parallel to tendon Unipennate muscle Bipennate muscle
  16. 16. M any factors may affect rate of cross-bridge cycling and thus force, including neural activation, calcium concentration, myosin ATPase activity, preloading, prestretch, muscle fiber type and ultrastructure, fatigue through a variety of mechanisms, and number of contractile components (myosin and actin) in parallel. 

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