Across
- 1. The name for the top of the lungs
- 6. The protein found in red blood cells
- 7. The main organ of the respiratory system
- 8. What filter microparticles out of the nasal cavity?
Down
- 2. The flap that covers the larynx
- 3. Where does external gas exchange occur?
- 4. What is the common name for altitude sickness?
- 5. What do fish use for gas exchange?