Swine lung alveolar cells facilitate gas exchange in pigs. The alveoli consist mainly of two types of epithelial cells: type I pneumocytes, which are thin and cover about 70-90% of the alveolar surface to facilitate gas exchange, and type II pneumocytes, which secrete surfactant to reduce surface tension and prevent alveolar collapse. Alveolar macrophages reside in the alveoli to remo... https://www.kosheeka.com/primary-cells-lifestyle-disease-models/