Pulmonary Alveoli

**Definition:** 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.

**Tree numbers:** - A04.411.715

**Synonyms:** - Alveoli, Pulmonary - Alveolus, Pulmonary - Pulmonary Alveolus