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A skinny 22-year-old male complains of severe cramping in his calves,…

- - - - INDIRECT DOWNSTREAM
        
        stress levels, diet
- - - - Action potential propagates along the sarcolemma and down T tubles
        
        2.calcium ions are released
        
        3.calcium binds to actin and blocking action of trypomysin removed
        
        4.myosin heads attach for contraction
        
        5.calcium removed from binding sites
        
        6.muscle relaxes
    - - fatty acids,glucose and amino acids
        
        gives energy to muscles and maintains homeostasis
    - - decreased glycogen, ionic imbalances, increased inorganic phosphate
    - - controlled consciously
      - cannot be controlled consciously
  - - - Myo, Mys, Sacro
    - - found only in heart
        
        involuntary, striated
    - - attached to bones and skin
        
        voluntary and striated
    - - in hollow organs
        
        involuntary, not striated
    - - glycolytic fibers
      - slow oxidative fibers
      - oxidative fibers
      - fast oxidative fibers
      - fast glycolytic fibers
    - - movement
        
        body posture
        
        stabilize joints
        
        generate heat
    - - receive and respond to stimuli
    - - shorten forcibly when stimulated
    - - to be stretched
    - - to recoil to resting length
    - - epimysium, perimysium, endomysium
    - - attachment to movable bone
    - - attachment to immovable bone
    - - direct and indirect
    - - striations, sarcomeres, myofilaments, molecular composition
    - - muscle fiber plasma membrane
    - - dense packed rodlike elements
    - - muscle fiber cytoplasm
    - - stripes formed by repeating dark and light bands
        
        A bands
        
        dark regions
        
        Z disc (line)
        
        I bands
        
        Lighter regions
        
        H zone and M line
    - - thin filaments
      - Myosin filaments
        
        thick filaments
    - - events at neuromuscular junction
        
        muscle fiber excitation
        
        excitation- contraction coupling
        
        cross bridge cycling
    - - generation and propagation of AP
    - - Restoration of resting conditions
    - - cross bridge formation
        
        working stroke
        
        cross bridge detachment
        
        cocking of myosin head
    - - simplest contraction
      - 3 phases of twitch
        
        latent period
        
        period of contraction
        
        period of relaxation
        
        Ca2+ reentry into SR
        
        cross bridge formation
        
        events of excitation- contraction coupling
- - - - INDIRECT DOWNSREAM
        
        Low blood sugar, cortisol increase
- - - - INDIRECT DOWNSTREAM
        
        inadequate blood supply