Respiratory system

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Across
  1. 2. the voice box
  2. 3. the throat
  3. 5. a large flat sheet of muscle that controls movement of air in and out of the lungs
  4. 6. a flap of tissue that closes when you swallow to prevent food from entering the airway
  5. 7. a passage in which air moves to the respiratory system
Down
  1. 1. two tubes that break up into each lung
  2. 4. an organ that exchanges oxygen and carbon dioxide