Across
- 2. Voice box
- 5. To breathe out.
- 7. Waste product expelled from the body
- 9. Prevents food from entering the trachea.
- 10. Windpipe that connects the throat to the lungs
- 12. Tubes that branch from the trachea into the lungs
- 14. System that includes lungs, trachea, bronchi
- 15. Sticky liquid that traps dust
Down
- 1. To breathe in
- 3. Tiny air sacs where gas exchange occurs
- 4. Process of exchanging gases
- 6. Essential gas inhaled for cellular respiration.
- 8. Muscle that aids in breathing
- 11. Throat; part of both respiratory and digestive systems.
- 13. Main organs of the respiratory system