Pulmonary alveoli/Definition

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Pulmonary alveoli [r]: In the lungs, small polyhedral outpouchings along the walls of the alveolar sacs, alveolar ducts and terminal bronchioles through the walls of which gas exchange between alveolar air and pulmonary capillary blood takes place.

This definition is at least in part based on: Anonymous (2023), Pulmonary alveoli (English). Medical Subject Headings. U.S. National Library of Medicine.