The mechanics of breathing

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Across
  1. 1. the bone that protects your heart and lungs
  2. 5. The primary organ on where respiration takes place
  3. 9. small air sacs in the lungs
  4. 10. biggest tube going into lungs
  5. 12. A tiny branch of air tubes in the lungs
  6. 14. 4% of this air is forced out of lungs during exhalation
  7. 15. The phase of breathing where air is expelled from the lungs
  8. 16. the muscles between the ribs that raise and lower the ribs
  9. 18. The process of moving air into and out of the lungs
  10. 19. breathing out
  11. 20. relaxes and moves upwards
Down
  1. 2. Pertaining to the small air sacs in the lungs where gas exchange occurs.
  2. 3. The blood cell where gas exchange takes place
  3. 4. the air that comes in during inhalation
  4. 6. Air passage involved in smelling and breathing
  5. 7. Relating to the lungs or the respiratory system.
  6. 8. The phase of breathing where air is taken into the lungs
  7. 11. breathing in
  8. 13. Tiny blood vessels where gas exchange occurs between the blood and body tissues.
  9. 17. Throat