Air leaves the alveolus, Air enters the alveolus, Wall of alveolus is only one cell thick, Wall of capillary is only one cell thick, Red blood cell carrying little oxygen, Red blood cell carrying lots of oxygen, Deoxygenated blood arrives at the alvoli, Oxygenated blood leaves the alveoli, Diffusion of carbon dioxide, Diffusion of oxygen.

Diffusion in an alveolus - labelled diagram

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