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15 cards from this deck
Gaseous exchange
Swapping O₂ and CO₂ between air and blood
Mouth/nose→trachea→bronchus→bronchioles→alveoli
Windpipe
Tiny air sacs at end of bronchioles
One cell thick
Diffusion
From alveolar air into blood
From blood into alveolar air
21%
16%
5%
Alveoli surface is moist
50−75 m250-75 \text{ m}^250−75 m2
Capillaries
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