al-vee-o-ler DUCT In lungs, the narrowed ending of bronchioles that opens into a cluster of alveoli. 739
Passageway which contains alveolar sacs
The opening through which air passes between the respiratory bronchioles and the alveoli.
Alveolar ducts are the tiny end tubules of the branching airways that fill the lungs. Each lung holds approximately 1.5 to 2 million of them. The tubules divide into alveolar sacs at the distal end.
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