respiratory system, gas exchange and breathing

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Across
  1. 3. muscle that contract when breathing in and relax when breathing out
  2. 4. tubes taking the air deeper into each lung
  3. 7. one gas that is exchanged in the air sac
  4. 11. action done by intercostal muscle when breathing in
  5. 12. tube linking the larynx with the bronchus
  6. 13. movement of air when chest cavity increase in volume
Down
  1. 1. site of gas exchange
  2. 2. part of blood oxygen bind to
  3. 5. the space inside the chest
  4. 6. natural movement of gases
  5. 8. a tube taking air into the 2 lungs
  6. 9. movement of air when chest cavity decrease in volume
  7. 10. action done by the intercostal muscle when breathing out