The Respiratory System

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Across
  1. 2. the muscle below your lungs that assists them to breathe
  2. 3. the part of the body that directs air from the mouth to the lungs
  3. 8. physical inhalation of oxygen and exhalation of carbon dioxide
  4. 11. air sacs in the lungs
  5. 12. the muscles within your ribs that help assist with breathing
  6. 15. main organ of the respiratory system; there are two of them
Down
  1. 1. the gas we breathe out
  2. 4. another word for breathing in
  3. 5. the boney compartments surrounding your lungs
  4. 6. the chemical process in cells where oxygen enters them
  5. 7. another word for breathing out
  6. 9. one of the body parts where oxygen enters your body
  7. 10. branches within the lungs
  8. 13. the tube going from the mouth down to the lungs
  9. 14. the gas we breathe in