Human lung parenchyma (alveolar tissue) samples are specimens of the functional tissue of the lungs, primarily composed of alveoli, alveolar ducts, and respiratory bronchioles. This tissue is the primary site of gas exchange and is crucial for understanding lung function and diseases affecting the distal airways and gas exchange units. These samples are invaluable for research into conditions such as emphysema, idiopathic pulmonary fibrosis, acute respiratory distress syndrome (ARDS), and other interstitial lung diseases. Researchers use them to study alveolar mechanics, epithelial-mesenchymal interactions, inflammation, and tissue remodeling in various lung pathologies. Samples can be provided as sections from fixed tissue in paraffin blocks or OCT, or as snapfrosts of fresh tissues.