part of part of has part has part contributes to morphology of pulmonary alveolar type 1 cell pulmonary alveolar type 2 cell lung pericyte parenchyma alveolus of lung alveolar system pulmonary alveolar parenchyma The distinguishing cell types of the lung alveolar tissue, including pulmonary epithelial cells (pneumocytes), alveolar capillary endothelial cells, interstitial cells (fibroblasts) and alveolar macrophages. UBERON:0008870 lung parenchyma