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Muscle Tissue (Properties of muscle tissue: (excitability: responds to…

- - - - applies to single muscle fibers; motor unit
      - summation: whole muscle contracting at varying strengths
        
        spatial summation
        
        temporal summation
  - - - a muscle shortens to produce movement
- - - - red in color= lots of mitochondria, myoglobin and blood vessels
    - - Split ATP at very fast rate
    - - used for weight lifting
      - anaerobic movements for short duration
- - - - stimulation from nervous system
    - - locomotion
    - - endomysium: connective tissue around individual muscle fibers
      - perimysium: CT around a bundle of muscle fibers
      - Epimysium: dense, CT sheet covering a whole muscle
      - fascicle: small bundles w/in a specific muscle
      - each skeletal muscle is supplied w/ nerve, 1 artery, and 2 veins
      - each motor neuron supplies multiple muscle cells AKA neuromuscular junction
      - muscle bunde
      - muscle fiber
        
        neuromuscular junction
      - myofibrilis
        
        tiny parallels fibers that are multi-nucleated
      - sarcolemma: thin translucent sheet
      - Myofilaments: contains bundles of proteins= myosin and actin
      - sarcoplasmic reticulum, mitochondria, T tubule, glycogen, lipids
  - - - no stimulation from nervous system
  - - - Visceral (single-unit)
        
        in the walls of hollow viscera and small blood vessels
      - Multiunit
        
        individual fibers w/ own motor neuron endings
- - - - ATP released a phosphate, ADP, and energy
- - - - excess ATP w/in resting muscle is used to form creatine phosphate
        
        creatine phosphate is 3-6 times more plentiful that ATP in muscle
        
        pyretic acid is converted to lactic acid
    - - if no oxygen is present -> ATP production from glycolysis and lactic acid formation
    - - ATP for any activity lasting over 30 seconds
      - does require oxygen
      - glucose is broken down to carbon dioxide and water -> releasing energy