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which structures are at the end of the smallest tubes in the lungs
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The alveoli (alveolar sacs).
The smallest airways (terminal/respiratory bronchioles) end in alveolar ducts and clusters of tiny air sacs called alveoli — thin-walled structures surrounded by capillaries where gas exchange occurs.
The smallest airways (terminal/respiratory bronchioles) end in alveolar ducts and clusters of tiny air sacs called alveoli — thin-walled structures surrounded by capillaries where gas exchange occurs.
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