The Body's Clean Up Crew
When the body makes waste it cannot keep, two curious kids follow the clean-up crew inside—watching how the kidneys, liver, and other helpers filter blood and carry waste safely out.
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🔬 Science Element
The circulatory system is a network of blood vessels powered by the heart. Arteries carry oxygen-rich blood away from the heart; veins return oxygen-poor blood back. This constant flow delivers nutrients to cells and removes carbon dioxide and other wastes.
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