human_reference_atlas connected to Homo sapiens anatomical entity anatomical entity (from UBERON) terminal bronchiole pulmonary acinus UBERON:0008874 UMLS:C0225696 arbor alveolaris Wikipedia:Acinus#The_Lungs pulmonary acinus uberon The largest lung subunit in which all airways participate in gas exchange, and it is composed of the parenchyma of the respiratory bronchioles, alveolar ducts, and alveoli. AS NCIT:C33426 pulmonary acini acinus pulmonaris pulmonary acinus FMA:7313 SCTID:361365004 EMAPA:37941