gaseous exchange

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  • gaseous exchange
    • diffusion
      • gas moves from an area of high concentration to an area of low concentration
    • diffusion gradient
      • the difference between high and low
      • steeper the gradient the greater the gaseous exchange
    • where it happens?
      • external
        • lungs
        • alveoli
      • internal
        • muscle tissue
    • PPO2
      • oxygenated blood
    • PPCO2
      • deoxygenated blood
    • external respiration
      • O2 level in alveoli is high
      • O2 moves to an area of low pressure
        • the capillaries
      • CO" levels in capillaries is high
        • moves to an rea of low pressure
          • alveoli
    • internal respiration
      • O2 levels high in capillaries
        • moves to an area of low O2
          • the muscle tissue
      • CO2 levels high in the muscle tissue
        • moves to an area of low CO2
          • the capillaries
    • assists to diffusion
      • thin membrane
      • short distance
      • large surface area
      • moist
      • always maintain diffusion gradient
    • partial pressure
      • the pressure exerted by an individual gas held in a mixture of gases
    • association
      • the combining of oxygen with haemoglobin to form oxyhaemoglobin
    • dissociation
      • the release of oxygen from haemoglobin for gaseous exchange
  • bohr shift

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