respiratory system

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Across
  1. 5. what you breath out
  2. 8. splits the air in to both your lungs
  3. 10. air collecting organ
  4. 11. tubes that connect bronchus to the alveoli
  5. 12. how oxygen enter your blood stream in a way
Down
  1. 1. vessels that return blood to the heart
  2. 2. what air travels though to get to lungs
  3. 3. lung inflator and deflator
  4. 4. it can be used as energy for the cells
  5. 6. bones that protect your organs
  6. 7. a piece if cartilage that you breath from
  7. 9. how your oxygen get in your blood stream