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Muscle physiology

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Muscle physiology by S3

Muscle physiology by S3

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