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Muscle physiology
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Muscle physiology

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Muscle physiology by S3

Muscle physiology by S3

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    Muscle physiology Muscle physiology Presentation Transcript

    • Muscle Physiology
      By
      S3
      B.N.Y.S(2nd Year)
      S-VYASA University
    • 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
    • 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…
    • Movement
      Stability
      Thermogenesis
      Body movement
      Respiration
      Constriction of organs and vessels
      Heart beat
      Functions of Muscle Tissue
    • 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
    • Types of muscles
    • Agonist
      Antagonist
      Classification of skeletal muscle
    • Moves a body segment in the intended direction
      causes a movement
      Agonist
    • Muscle opposing the agonists, acts in the opposite direction
      Antagonist
    • Anatomy of skeletal muscle
    • Actin
    • Myosin
    • Neuromuscular Junction
    • Sliding Filament Mechanism of Muscle Contraction
    • mu
    • Tone of the Muscle
    • Natural firmness of muscles when they are not flexed
      Tightness of a muscle
      Some fibers are always contracted
      Hypertonia
      Atonia
      Tone of the Muscle
    • Isotonic contraction
      Isometric contraction
      Contractions based on tone
    • Stretch Reflex
    • 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
    • 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
    •  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
    • Golgi Tendon
    • 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
    • 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
    • Questions
    • Textbook of Medical Physiology
      -Guyton & Hall
      www.youtube.com
      Bibliography