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How does the circulatory and respiratory system work together

User Mike Webb
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The respiratory system takes the oxygen, from outside the body, into the circulatory system which takes the oxygen through the bloodstream, and through the other parts of the body.
User Pizzamonster
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The respiratory system takes oxygen in and takes it to the circulatory system which takes it to the rest of the body wich uses the oxygen for energy.
User Buzibuzi
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