alveolar duct
US /ælˈviː.ə.lər dʌkt/
UK /ælˈviː.ə.lər dʌkt/
1.
a tiny duct that connects the respiratory bronchioles to the alveolar sacs, which contain the alveoli (air sacs) in the lungs
:
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Oxygen and carbon dioxide exchange occurs across the thin walls of the alveoli, which are connected by the alveolar duct.
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Each alveolar duct branches into several alveolar sacs.