Respiratory System

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