Across
- 3. Opening between the vocal cords in the larynx.
- 4. Smallest branches of the bronchi.
- 5. Passageway for air and food.
- 7. Flap of tissue that prevents food from entering the windpipe.
- 9. Major air passages that branch from the trachea.
- 14. Instrument used to measure the air capacity of the lungs.
- 15. Also known as the windpipe.
- 17. Maximum amount of air a person can expel from the lungs after a maximum inhalation.
- 19. Membrane surrounding the lungs.
- 20. Process of expelling air from the lungs.
- 21. Substance that traps and allows for the removal of microbes.
- 23. Contains the vocal cords.
- 25. Cells that secrete mucus in the respiratory tract.
- 29. Gas primarily exhaled by the lungs.
- 30. Muscles between the ribs that help form and move the chest wall.
Down
- 1. Muscle that plays a key role in breathing.
- 2. Protein in red blood cells binding to oxygen.
- 6. Tiny air sacs where gas exchange occurs.
- 8. Air-filled spaces in the skull that help regulate the temperature and humidity of the air taken in.
- 10. Deficiency in the amount of oxygen reaching the tissues.
- 11. Process of taking air into the lungs.
- 12. Respiratory condition marked by spasms in the bronchi.
- 13. Amount of air inhaled or exhaled during a normal breath.
- 16. Main external opening for the respiratory system.
- 18. Keeps the trachea from collapsing.
- 22. Small blood vessels surrounding alveoli.
- 24. System responsible for gas exchange.
- 26. The process of moving air in and out of the lungs.
- 27. Tiny hair-like structures that protect the nasal passageways and other parts of the respiratory tract.
- 28. Gas primarily absorbed by the lungs.