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Why do the walls of the capillaries and air sacs have to be thin
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Why do the walls of the capillaries and air sacs have to be thin

User Martin Schmelzer
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The alveoli are lined with mucus and are surrounded by a network of blood capillaries. They have very thin walls for gases to be absorbed through.Carbon dioxide diffuses from the blood into the alveoli.
User Ryanbraganza
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