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Your circulatory system is made up of three independent systems working together—the cardiovascular system (your heart and blood vessels), the pulmonary system (which moves blood to and from your lungs), and the systemic system (which delivers blood throughout your body)—all of which work to transport oxygen, nutrients, and other vital materials where they need to go. This matters because without your circulatory system constantly moving these essential substances through your body, your cells and organs couldn't function.

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