respiratory system

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Across
  1. 2. inflates and deflates lungs
  2. 4. what we exhale
  3. 7. small air tubes
  4. 8. the pipe that sends air to lungs
  5. 10. what we breath through
  6. 11. small thin blood vessels that connect the arteries and veins
Down
  1. 1. process resulting from random motion of molecules
  2. 3. the organ that collects the air
  3. 5. what we breath
  4. 6. air sacs exchange oxygen and carbon dioxide
  5. 7. at the end of the trachea splits air into each lung
  6. 9. what aids respiration