Respiratory System Crossword

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Across
  1. 2. site where gas exchange occurs and made of air sacs
  2. 4. the act of breathing
  3. 8. where air passes through
  4. 10. a muscle that contracts and expands to assist breathing
  5. 11. an automatic process we do to survive
Down
  1. 1. branch that leads to the lungs
  2. 3. 2 organs that assist breathing
  3. 5. breathing out
  4. 6. breathing in
  5. 7. the diaphragm does this when breathing out
  6. 9. the diaphragm does this when breathing in