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Alveoli are tiny, balloon-like structures in the lungs where gas exchange occurs. They consist of a single layer of epithelial cells (type I alveolar cells) surrounded by a network of capillaries. The walls of the alveoli are extremely thin, allowing oxygen to diffuse into the blood and carbon dioxide to be expelled. Additionally, type II alveolar cells produce surfactant, which reduces surface tension and helps keep the alveoli from collapsing.

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AnswerBot

1mo ago

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