7. Write down conditions that favour Oxygen exchange/transport?
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Explanation:
Alveoli are in direct contact with capillaries (one-cell thick) of the circulatory system. Such intimate contact ensures that oxygen will diffuse from alveoli into the blood and be distributed to the cells of the body.
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Answer:
Alveoli are the very small air sacs where the exchange of oxygen and carbon dioxide takes place.
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