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.
El río dentro de ti
Dos niños curiosos se encogen para recorrer un río torrencial dentro del cuerpo y siguen cómo viaja la sangre.
Spanish version coming soon.
This story is not available in Spanish yet. You can keep reading in English, or check back soon for the Spanish PDF and quiz.
Spanish version coming soon.
This story is not available in Spanish yet. You can keep reading in English, or check back soon for the Spanish PDF and quiz.
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🔬 Science Element
El sistema circulatorio es una red de vasos sanguíneos impulsada por el corazón. Las arterias llevan sangre rica en oxígeno lejos del corazón; las venas devuelven sangre pobre en oxígeno. Este flujo constante entrega nutrientes a las células y elimina dióxido de carbono y otros desechos.
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