respiratory system

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Across
  1. 4. breathing out
  2. 6. pumps the lungs
  3. 7. air sac for gas exchange
  4. 9. cavity purifies the air
  5. 10. primary respiratory organ
Down
  1. 1. windpipe
  2. 2. air passage to alveoli
  3. 3. breathing in
  4. 5. organ between abdomen and neck
  5. 8. organ of voice