reasons for the efficiency of the human gas exchange system

the lungs of a mammal achieve a very efficient gas exchange system this will tell you why.

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Quick circulation as capillaries carry away O2 and bring CO2.
Many
alveoli
Lung capillaries have a large total surface area.
Fresh O2 in lungs every time you breathe in
O2 only passes through 2 cell layers:
1) Alveolar epithelium
2) Capillary endothelium
Both cell types are squamous epithelial cells which means they're very thin

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