Definition: alveoli -

Bronchioles and alveoli histology: Video & Anatomy alveoli Alveoli allow oxygen to enter the blood They are very thin to let oxygen move from the lungs to the blood vessels, and for carbon dioxide to be alveoli Alveoli are thin-walled, sac-like structures lined by a single layer of flattened squamous epithelial cells: type I pneumocytes This extremely thin nature of

alveoli The terminal bronchioles then subdivide into respiratory bronchioles which subdivide into alveolar ducts Numerous alveoli and alveolar sacs