Across
- 3. A mineral that helps blood carry oxygen.
- 5. Very small living things; some can cause illness.
- 6. A tube that carries blood back to the heart.
- 8. To control or keep something at the right level.
- 10. A nutrient that helps build muscles and body parts.
- 11. Tubes that carry blood away from the heart.
- 12. Broken down so the body can use food.
Down
- 1. To take in or soak up.
- 2. A nutrient that helps the body stay healthy.
- 4. Something that breaks things down or changes them.
- 7. A helpful substance in food that gives the body energy and strength.
- 9. organ that stores urine before it leaves the body.