Thin walls – alveolar walls are one cell thick providing gases with a short diffusion distance. … Permeable walls – allow gases to pass through. Extensive blood supply – ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
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Adaptations of the alveoli:
Thin walls – alveolar walls are one cell thick providing gases with a short diffusion distance. … Permeable walls – allow gases to pass through. Extensive blood supply – ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.