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KEY CONCEPT The respiratory and circulatory systems bring oxygen and nutrients to the cells. The respiratory and circulatory systems work together to maintain homeostasis. The respiratory system moves gases into and out of the blood. The lungs contain the bronchi, bronchioles, and alveoli

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The circulatory and respiratory systems work together to give the body the oxygen it needs. They also work together to get rid of carbon dioxide, which is a waste product in the body.

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