Respiratory System

Respiration and Breathing

What is pulmonary surfactant?

Pulmonary surfactant is an oily substance (a mixture of lipoprotein molecules) produced by the cells lining the alveoli. Since all parts of the respiratory system are coated with a thin watery layer, the surfactant coats this watery layer and reduces the surface tension within the alveoli. This helps keep the alveoli open for gas exchange.


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