Muscle physiology

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Muscle physiology by S3

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Muscle physiology

  1. 1. Muscle Physiology<br />By<br />S3<br />B.N.Y.S(2nd Year)<br />S-VYASA University<br />
  2. 2. Contents…<br />Introduction<br />Functions of muscle tissue<br />Properties of muscle tissue<br />Types of muscles<br />Agonist and antagonist<br />Anatomy of skeletal muscle<br />Neuromuscular junction<br />Sliding Filament Mechanism of Muscle Contraction<br />Tone of the Muscle<br />Stretch Reflex<br />Golgi Tendon<br />Questions<br />Bibliography<br />
  3. 3. Latin- Musculus (Mouse)<br />Muscle is a contractile tissue <br />It contains contractile filaments that move past each other and change the size of the cell<br />Introduction…<br />
  4. 4. Movement<br />Stability<br />Thermogenesis<br />Body movement<br />Respiration<br />Constriction of organs and vessels<br />Heart beat<br />Functions of Muscle Tissue<br />
  5. 5. Excitability<br />capable of response to chemical signals, stretch or other signals & responding with electrical changes across the plasma membrane<br />Conductivity<br />local electrical change triggers a wave of excitation that travels along the muscle fiber<br />Contractility -- shortens when stimulated<br />Extensibility -- capable of being stretched<br />Elasticity -- returns to its original resting length after being stretched<br />Properties of Muscle tissue<br />
  6. 6. Types of muscles<br />
  7. 7. Agonist<br />Antagonist<br />Classification of skeletal muscle<br />
  8. 8. Moves a body segment in the intended direction <br />causes a movement<br />Agonist<br />
  9. 9. Muscle opposing the agonists, acts in the opposite direction<br />Antagonist <br />
  10. 10.
  11. 11. Anatomy of skeletal muscle<br />
  12. 12.
  13. 13.
  14. 14. Actin<br />
  15. 15. Myosin<br />
  16. 16. Neuromuscular Junction<br />
  17. 17.
  18. 18. Sliding Filament Mechanism of Muscle Contraction<br />
  19. 19.
  20. 20.
  21. 21.
  22. 22.
  23. 23.
  24. 24.
  25. 25.
  26. 26.
  27. 27.
  28. 28. mu<br />
  29. 29. Tone of the Muscle<br />
  30. 30. Natural firmness of muscles when they are not flexed<br />Tightness of a muscle<br />Some fibers are always contracted<br />Hypertonia<br />Atonia<br />Tone of the Muscle<br />
  31. 31. Isotonic contraction<br />Isometric contraction<br />Contractions based on tone<br />
  32. 32. Stretch Reflex<br />
  33. 33. Intrafusal muscle fibersare skeletal muscle fibres that comprise the muscle spindle and are innervated by gamma motor neurons. These fibers are proprioceptors that detect the amount and rate of change of length in a muscle. These fibers are walled off from the rest of the muscle by a collagen sheath. This sheath has a spindle or "fusiform" shape, hence the name "intrafusal."<br />Intrafusal Muscle Fibre<br />
  34. 34. Extrafusal muscle fiber is a term given to standard muscle fibers as to distinguish them from intrafusal muscle fibers. Extrafusal muscle fibers are innervated by alpha motor neuron and generate tension by contracting, thereby allowing for skeletal movement.<br />Extrafusal Muscle Fibers<br />
  35. 35.  motor neuron supply intrafusal fibers<br />When a muscle is stretched stretch receptors in the intrafusal fibres are stimulated<br />Impulse is transmitted to the spinal cord<br /> motor neuron is stimulated <br />muscle is contracted<br />Stretch Reflex<br />
  36. 36. Golgi Tendon<br />
  37. 37. Sensory receptor that inhibits tension development in a muscle and initiates tension development in the antagonist muscles<br />KEY: sense tension<br />stimulated by the presence of active tension in a muscle<br />Golgi Tendon Organ<br />
  38. 38. Inhibits muscle tension in the muscle generating too much force and initiates development of muscle tension in the antagonist muscle (excites)<br />Golgi Tendon Organ- Action<br />
  39. 39. Questions<br />
  40. 40. Textbook of Medical Physiology<br /> -Guyton & Hall<br />www.youtube.com<br />Bibliography<br />

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