Across
- 3. muscle at the base of chest cavity
- 7. a process that includes the use of oxygen to break down glucose
- 9. breath out
- 10. throat
Down
- 1. the gas exchange between your red blood cells and body cells
- 2. breathing in
- 4. small hairs in the respiratory tract
- 5. the outer-linings of the lungs
- 6. the large tubes in each lung
- 8. a gas required for respiration