Across
- 4. immune system overreacts to substances in environment
- 7. it pumps the blood through your body
- 8. a type of brain injury from a blow to the head
- 10. how the body breaks down food you eat for
- 11. essential substances our bodies need to be healthy
Down
- 1. injections or nasal sprays to help you fight diseases
- 2. clean water and sewage for the public
- 3. they filter the blood
- 5. a severe headache often with sensitivity to light and sound
- 6. physical activity
- 9. eating a healthy, balanced diet