what is seen at the tip of the bronchioles in respiratory system
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Alveoli are microscopic air sacs served by the bronchioles. Hundreds of millions of alveoli exist inside each lung. They are the terminal ends of the respiratory tract and the sites of external respiration—the exchange of gases between the air and the bloodstream.
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Alveoli are microscopic air sacs served by the bronchioles. Hundreds of millions of alveoli exist inside each lung. They are the terminal ends of the respiratory tract and the sites of external respiration—the exchange of gases between the air and the bloodstream.
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