Across
- 3. tiny sacs and the site of gas exchange
- 5. tiny projections on cells that help to move substances
- 7. the main organ of the respiratory system
- 10. flips to cover the trachea when swallowing food or liquids
- 11. located at the back of the nose and mouth
- 12. muscle located under the lungs
- 13. composed of 20 c-shaped cartilage rings
- 14. taking air into the lungs
- 15. the structure that protects the lungs and heart
Down
- 1. otherwise known as the voice box
- 2. movement of substances from high to low concentrations
- 4. warms and moistens air (2 words)
- 6. letting air out of the lungs
- 8. an opening between vocal folds
- 9. tubs that lead from the trachea into the lungs