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Across
  1. 2. small sacs; site of gas exchange
  2. 5. small blood vessels
  3. 6. windpipe
  4. 7. throat
  5. 10. muscles around the rib cage
Down
  1. 1. branch-like structures in the lungs
  2. 3. dome-shaped organ under the rib cage
  3. 4. voice box
  4. 8. where air enters the body
  5. 9. pair of organs inside the ribcage