The respiratory system

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Across
  1. 2. the muscle that works with your lungs
  2. 4. the waste exhales from the body
  3. 7. small air tubes
  4. 8. sends oxygen to cells
  5. 10. you can smell with
  6. 11. the smallest blood vessel
Down
  1. 1. change of density
  2. 3. the organ responsible for breathing
  3. 5. the thing we breath
  4. 6. air sacs for the lungs
  5. 7. the airways for the lungs
  6. 9. protection for the lungs