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What keeps us alive?
Words to learn: heart • lungs • blood • oxygen • circulation
The lungs bring oxygen into the body, the heart pumps blood, and the circulation carries oxygen and nutrients to working cells while carrying wastes away.
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Where does this mystery belong?
HUMAN BODY — CIRCULATION AND BREATHING, PAGES 16–23. Textbook spread and protected page link to be added.
Who uses this knowledge?
