Gas exchange system.

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Gas exchange system.

alveoli surface:

  • has a large surface area.
  • small distance between source and destination.
  • high conc gradient.


  • movement of air over the gas exchange surface.
  • air always flows from high pressure to low.

pulmonary veniltation:

  • volume of air ventilating each min.
  • tidal volume is the normal volume breathed in each breath.
  • can increase so that oxygen can diffuse from air to blood faster and carbon dioxide from blood to air faster.
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