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
When you breathe in, air travels through the nose or mouth, down the trachea, and into the lungs. Oxygen passes from tiny air sacs called alveoli into the blood, while carbon dioxide moves out to be exhaled. This gas exchange fuels cells throughout the body.
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