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Pulmonary surfactant is a surface-active lipoprotein complex (phospholipoprotein) formed by type II alveolar cells. The proteins and lipids that make up the surfactant have both hydrophilic and hydrophobic regions.
1. A substance, such as detergent, that is added to a liquid to increase its ability to spread. 2. A substance produced by the tiny air-filled sacs of the lung that reduces the surface tension of the fluids coating the lung.Surfactant helps keep the tiny air sacs from collapsing during normal breathing. substance, such as detergent, that is added to a liquid to increase its ability to spread. 2. A substance produced by the tiny air-filled sacs of the lung that reduces the surface tension of the fluids coating the lung. Surfactant helps keep the tiny air sacs from collapsing during normal breathing.