How are the alveoli of the lungs arranged? What is their function? What is a Sufractant?

Alveoli – numerous thinnest vesicles formed by a single-layer epithelium, braided by a dense network of capillaries. Part of the epithelial cells secrete a special substance – a suffractant, which prevents adhesion of the alveoli and has an antibacterial effect. Gas exchange occurs through the walls of the alveolar capillaries due to the diffusion of gases.

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