The circulatory system is like a big delivery network inside our bodies. It includes the heart, blood, and blood vessels. The heart is a super important pump that sends blood all around, delivering oxygen and nutrients to our cells and picking up waste like carbon dioxide. Arteries carry the blood away from the heart, while veins bring it back. This system helps keep us healthy and active by making sure all our body parts get what they need to work properly!
make me a short paragraph about the circulatory system (make it like a 7th grader wrote it)
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