Across
- 3. The muscle that controls breathing
- 5. The method of travel for oxygen molecules
- 8. Another term for breathing out
- 9. Another term for breathing in
Down
- 1. The first step after inhalation
- 2. The chemical used for flavoring popcorn and vapes
- 4. A lung condition caused by inhaling toxic chemicals
- 6. One chemical taken in during inhalation
- 7. Things that expand in order to allow inflation of the lungs