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Note:
Pulmonary surfactant is a mixture of lipids and specific proteins lining the alveoli and the terminal bronchioles. Surfactant lipids generate a monolayer at the air-liquid interface, which lowers alveolar surface tension to value < 10 mN/m at end-expiration, keeping intra-alveolar pressures relatively consistent throughout the lung, preventing the collapse of smaller bronchioles and alveoli.
