Respiratory system

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Across
  1. 3. the area containing vocal cords
  2. 4. another word for windpipe
  3. 7. a flap of tissue in the back of your throat
  4. 8. tubes these let air in and out of your lungs
  5. 10. a hollow tube that starts behind the nose
  6. 11. organs on either side of the chest
  7. 12. a colorless gas we need to survive
Down
  1. 1. either of two openings of the nasal cavity
  2. 2. large air passage that goes to the windpipe to the lungs
  3. 5. dioxide a gas with a density of 53% higher then dry air
  4. 6. located below the lungs
  5. 7. a tube that goes from the throat to the stomach
  6. 9. tiny air sacs