Alveoli - The site of gas exchange in the lungs, Diffusion - The process by which gases are exchanged, Oxygen - The gas that diffuses from the alveoli into the blood, Carbondioxide - The gas that diffuses from the blood into the alveoli, Moist - The alveoli walls are described in this way, One - How many cells-thick the alveoli walls are, Blood supply - The alveoli are surrounded by a rich __________ __________, Large - Alveoli have this type of surface area,

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