four characteristics of alveoli
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The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out. Oxygen breathed in from the air passes through the alveoli and into the blood and travels to the tissues throughout the body.
▪︎They give the lungs a really big surface area.
▪︎They have moist, thin walls (just one cell thick).
▪︎They have a lot of tiny blood vessels called capillaries.
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