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An alveolus (plural: alveoli, frae Laitin alveolus, "little cavity") is an anatomical structur that haes the form o a hollae cavity.[1] Foond in the buff parenchyma, the pulmonary alveoli are the terminal ends o the respiratory tree, which outcrop frae either alveolar sacs or alveolar ducts, which are baith steids o gas exchynge wi the bluid as well.[2]

Pulmonary alveolus
Alveolus diagram.svg
The alveoli
Laitin alveolus pulmonis
Code TH H3.
TH H3.
Anatomical terminology


  1. Weibel, E. R. (1963). Academic Press, ed. Morphometry of the human lung. p. 151. ISBN 3-540-03073-5. 
  2. Hansen, J. E.; Ampaya, E. P.; Bryant, G. H. and Navin, J. J. (1975). "The Branching Pattern of Airways and Air Spaces of a Single Human Terminal Bronchiole". Journal of Applied Physiology. 38 (6): 983–989. PMID 1141138.