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The exchange of respiratory gases in the alveoli is a vital process that ensures oxygen is supplied to body tissues and carbon dioxide is removed from the body. Alveoli are minute, thin-walled, sac-like structures present at the terminal ends of bronchioles in the lungs. They provide a very large surface area and are closely surrounded by a dense network of pulmonary capillaries, which facilitates efficient gaseous __________ _________ ______ _______ ___.
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