The Body's Tiny Defense System
When a sniffle strikes, two curious kids shrink down to meet the body's tiny defenders—white blood cells, antibodies, and more—as they discover how the immune system spots germs and fights them off.
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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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