Respiratory System

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Across
  1. 3. also known as the voice box
  2. 5. two large tubes that enter the lungs
  3. 7. to breathe in
  4. 8. outside covering of the lung
  5. 13. covers the trachea during swallowing
  6. 15. smaller tubes that branch throughout the lungs
  7. 16. to breathe out
Down
  1. 1. gas breathed in
  2. 2. gas breathed out
  3. 4. back of the throat and mouth
  4. 6. the breathing system
  5. 9. air sacs in the lungs
  6. 10. organs the size of a football
  7. 11. the windpipe
  8. 12. strong muscle that allows breathing
  9. 14. air enters through this