Gas exchange system.
- 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.
- 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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