Respiratory system

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Across
  1. 3. common name for the trachea
  2. 5. The place where oxygen enters the blood
  3. 8. large muscle that controls the lungs
Down
  1. 1. gas that you breathe out
  2. 2. a group of muscles use for exhaling
  3. 4. most common illness that affects the system
  4. 6. moves air from and to the lungs
  5. 7. prevents food from going into your lungs