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afruda2610
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. An individual air sac is called an alveolus. The layer of moisture in the alveoli allows gases to dissolve so that they can diffuse quickly.
ayathristudies

the alveoli in the lungs are tiny air sacs and they absorb/diffuse oxygen into the bloodstream.

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