The alveolar wall.
D000818:Animals; D002196:Capillaries / Q000166:cytology; D002462:Cell Membrane / Q000032:analysis; D004848:Epithelium; D006801:Humans; D008264:Macrophages; D008854:Microscopy, Electron; D008855:Microscopy, Electron, Scanning; D011650:Pulmonary Alveoli / Q000098:blood supply / Q000166:cytology* / Q000196:embryology / Q000294:innervation; D011651:Pulmonary Artery; D011817:Rabbits; D051381:Rats; D013500:Surface Tension; D013501:Surface-Active Agents / Q000032:analysis
D013501:Surface-Active Agents