Alveolar surfactant表面活性物质 a Secreted by type l alveolar epithelial cells Surfactant is a complex mixture of Several phospholipids(二软脂酰卵磷脂 dipalmitoyl phosphatidyl choline, DPPC) Surfactant-associated proteins lons(calciumAlveolar surfactant表面活性物质 ◼ Secreted by type II alveolar epithelial cells ◼ Surfactant is a complex mixture of – Several phospholipids (二软脂酰卵磷脂 dipalmitoyl phosphatidyl choline, DPPC) – Surfactant-associated proteins – Ions (calcium)