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There is no anatomical connection of circulatory system with the respiratory system. Blood capillaries come in close contact with the lung alveoli. The area of contact is about 1000 square feet. But there are two thin membranes to separate blood and air. The walls of capillaries and the walls of alveoli. Both have flat and thin epithelium. The gases readily pass across these membranes.

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Cordie Wolff

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3y ago

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