MeSH 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.;
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.