Respiratory system

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Across
  1. 3. clusters of tiny air sacs
  2. 7. process that makes energy from food
  3. 8. bones that protect lungs
  4. 9. a chronic inflammatory disease
  5. 10. closes off the trachea
  6. 13. the gas we breath out
  7. 14. breathing out
Down
  1. 1. another word for breathing
  2. 2. muscle that controls lung movement
  3. 4. the deepest breath you can take
  4. 5. largest branches of the lungs
  5. 6. tiny hair like structures that line nasal passage
  6. 11. air is 21% this gas
  7. 12. wind pipe