The Respiratory System

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Across
  1. 2. the main organ of the respiratory system
  2. 3. where gas exchange of oxygen and carbon dioxide occurs
  3. 4. we breath it out
  4. 7. the muscle that pushes air out of your lungs
  5. 8. when we breath in
  6. 10. we breath it in
  7. 11. the hairs in your nose
  8. 12. when we breath out
Down
  1. 1. to not use oxygen when we exercise
  2. 5. to use oxygen when we exercise
  3. 6. it stops you from choking
  4. 9. the medical name of your voice box