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Pani-rosa [81]
3 years ago
14

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

Biology
1 answer:
dmitriy555 [2]3 years ago
7 0
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.
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