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Alveoli are the small air sacs in the lungs. There are about 350 million alveoli in our lungs. Alveoli are the spaces where blood collects oxygen and releases carbon dioxide . The oxygen fron the alveoli enters the blood through capillaries and the carbon dioxide from the blood passes into the alveoli.
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Alveoli is a sac like structure in Lungs in which exchange of gases takes place.
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