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Muscle Tissue Chapter 10

Muscle Tissue Chapter 10. Functions of Muscular Tissue. Producing body movements Stabilizing body positions Storing and movement of substances in the body Producing heat. Properties of Muscular Tissue. Excitability Contractility Extensibility Elasticity. Types of Muscle.

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Muscle Tissue Chapter 10

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  1. Muscle Tissue Chapter 10

  2. Functions of Muscular Tissue Producing body movements Stabilizing body positions Storing and movement of substances in the body Producing heat Properties of Muscular Tissue Excitability Contractility Extensibility Elasticity

  3. Types of Muscle Skeletal Muscle Cardiac Muscle Smooth Muscle

  4. Types of Muscle

  5. Connective Tissue Components

  6. Muscle Attachments Attachment - connective tissue layers extend to attach to bone (tendon or aponeurosis) Insertion - attachment to a movable bone Origin - attachment to stationary bone

  7. Anatomy of a Muscle Fiber

  8. Anatomy of a Muscle Fiber

  9. Myofibril and Sarcomere

  10. Sarcomere Dark(A) & light(I) bands visible with an electron microscope

  11. Sarcomere

  12. Thick and Thin Filaments

  13. Skeletal Muscle Fiber Proteins

  14. Sliding Filament Mechanism

  15. The Contraction Cycle

  16. Excitation - Contraction Coupling

  17. Neuromuscular Junction

  18. Summary

  19. Contraction of a Skeletal Muscle Motor Unit: A motor neuron and all the muscle fibers it innervates.

  20. Contraction of a Skeletal Muscle Muscle Twitch: Response of a muscle to a single stimulus

  21. Contraction of a Skeletal Muscle Graded Muscle Responses Graded - variation in degree of contraction 1. Frequency of stimulation Wave summation and Tetanus 2. Strength of the stimulus Motor Unit Recruitment More motor units stimulated which leads to more muscle fibers responding.

  22. Wave Summation and Tetanus

  23. Muscle Tone Involuntary contraction of a small number of motor units which leads to partial state of contraction of relaxed muscles Keeps muscles firm even though relaxed Essential for maintaining posture

  24. Isotonic and Isometric Contractions Isometric - muscle applies tension but does not move the load Isotonic - muscle changes length load is moved

  25. Muscle Metabolism

  26. Muscle Fatigue • Inability to contract after prolonged activity • central fatigue is feeling of tiredness and a desire to stop (protective mechanism) • depletion of creatine phosphate • decline of Ca2+ within the sarcoplasm • Factors that contribute to muscle fatigue • insufficient oxygen or glycogen • buildup of lactic acid and ADP • insufficient release of acetylcholine from motor neurons

  27. Types of Skeletal Muscle Fibers

  28. Types of Smooth Muscle

  29. Microscopic Anatomy

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