has part has part has_part characteristic of has modifier overexpanded pulmonary alveolus overexpanded respiratory alveoli alveolus dilation MPheno.ontology dilated alveolus alveoli dilation enlarged alveoli overexpanded pulmonary alveoli dilated alveoli MP:0001183 expanded volume of one or more of the saclike terminal dilations of the respiratory bronchioles, alveolar ducts and alveolar sacs across which gas exchance occurs between alveolar air and the pulmonary capillaries enlarged alveolus overexpanded respiratory alveolus abnormal pulmonary alveolus morphology abnormal increased volume alveolar system