Surfactant is a substance composed primarily of lipids and proteins that is produced by the cells of the alveoli (the small air sacs in the lungs) in mammals, including humans. The primary function of surfactant is to reduce surface tension at the air-liquid interface in the alveoli, which helps to keep the alveoli open and prevents them from collapsing during exhalation. This is crucial for effective gas exchange, as it allows the lungs to


