Across
- 2. the passages that direct air into the lungs
- 4. main organ of the respiratory system
- 7. high blood pressure
- 9. smallest branches of the bronchi
- 10. upper chambers of the heart
Down
- 1. inflammation of the bronchi
- 3. blood vessels that carry blood back to the heart
- 5. either of two openings in the nose
- 6. lower chambers of the heart
- 8. liquid part of blood