Respiratory system

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Across
  1. 2. the muscular tube through which food passed from the throat to the stomach
  2. 5. bone that protects lungs
  3. 6. chronic lung disease caused by inflammation
  4. 7. a pair of organs in the chest that supply the body with oxygen
Down
  1. 1. two external openings of the nasal cavity
  2. 3. the large tubes that direct the air you breathe to your right and left lungs
  3. 4. the airway that leads from the larynx to the bronchi
  4. 6. the part of the body between the chest and pelvis