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
Blood travels through the body carrying oxygen. The heart pumps blood, red blood cells deliver oxygen, white blood cells help fight germs, and platelets help close cuts so the body can heal.
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