Across
- 3. pumps blood
- 5. blood vessels that exchange substances with cells
- 10. where oxygen goes
- 12. muscles that help your lung pull air in and push air out
- 15. to absorb nutrients from food
- 16. blood vessels that take blood away from the heart
- 17. blood vessels that take blood to the heart
- 18. produces enzymes and controls our energy reserves
- 19. voice box
- 20. small branches that lead to each lung
Down
- 1. bottom chamber of the heart
- 2. tiny air sacs at the end of the bronchiole
- 4. you breathe out
- 6. throat
- 7. 1 of 4 valves that control blood flow in the heart
- 8. you have 2 of
- 9. top chamber of your heart
- 11. you breathe in
- 13. the main artery that carries blood away from the heart to the rest of your body
- 14. moves blood and nutrients around the body