Across
- 3. makes sounds
- 6. passage that direct air into the lungs
- 7. movement of air into and out of the lungs
- 8. what is another name for pharynx
- 9. breathing is controlled by
- 11. what moisten cleans and warms the air
Down
- 1. what is one thing that respiration produce
- 2. what is another name for trachea
- 4. Dark sticky substance that is formed when tobacco burns
- 5. makes lung contract
- 10. what is the main organ of the respiratory system