Pulmonary surfactant. a phospholipid-protein complex that lines the alveoli and small airways of the lungs. is secreted by type ll alveolar epithelial cells. Recognized functions of surfactant are (1) maintaining proper humidity of the alveolar wall; (2) providing a constant essential factor for easier pulmonary elastic recoil and reducing the work of breathing during passive expirati... https://danddcollectiblers.shop/product-category/skin-care/