The Respiratory System

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Across
  1. 2. small air sacs
  2. 4. breathing in
  3. 7. another name for trachea
  4. 8. cage protects heart and lungs
  5. 9. portable treatment device
  6. 10. another name for voicebox
  7. 11. protects the lungs
Down
  1. 1. flap of skin that stops food from entering the airway
  2. 3. breathing out
  3. 5. air enters here
  4. 6. females fastest growing population of smokers