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____ are the small sacs that are the site of gas exchange in the lungs
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____ are the small sacs that are the site of gas exchange in the lungs

User Saurav Nagpal
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7 votes

Answer:

alveoli

Step-by-step explanation:

They are the smallest structures in our lungs where capillaries exchange O2 and CO2 in blood.

User StationaryTraveller
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