respiratory system

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