Across
- 3. small bags where gas exchange takes place
- 4. not breathing
- 7. chest cavity
- 9. synonym of ventilation
- 12. breathing in
- 13. breathing out
- 15. the body's food pipe
Down
- 1. below the lungs large muscle sheet
- 2. name of the system responsable for breathing
- 5. process in which air moves in and out
- 6. gas you need for respiration
- 8. what protects the lungs
- 10. the blood pumping organ
- 11. tiny hairs that help remove dirt and microorganisms
- 14. organ that works like baloons in your body