Across
- 1. Tiny air sacs where gas exchange occurs
- 3. Bluish discoloration of the skin caused by low oxygen levels
- 4. Part of the brain that controls breathing
- 7. The act of breathing in
- 9. Tubes that branch off from the trachea into the lungs
- 10. Disease that causes destruction of alveoli, often from smoking
- 14. Space behind the nose and mouth that leads to the trachea
- 15. Maximum amount of air a person can exhale after a deep breath
- 16. Required gas for cellular respiration
- 19. Organ where oxygen enters the blood
- 20. Structure that prevents food from entering the trachea
Down
- 2. The movement of air into and out of the lungs
- 5. Disease characterized by narrowed airways and wheezing
- 6. Voice box
- 8. Ability to consciously control breathing
- 11. Muscle that separates the chest cavity from the abdomen
- 12. Tube that carries air from the throat to the lungs
- 13. Inflammation of the bronchial tubes
- 17. Opening between the vocal cords
- 18. A pause in breathing during sleep