Circulatory and Respiratory System Crossword

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Across
  1. 3. the exchange of gases between the blood and the body's cells
  2. 6. the mechanical movement of air into and out of your lungs
  3. 10. the bottom chambers of the heart
  4. 12. help form blood clots to stop or prevent bleeding
  5. 16. contain hemoglobin which delivers oxygen all over the body
Down
  1. 1. long tube in the chest cavity; windpipe
  2. 2. diffuses into alveoli to be returned to the atmosphere during external respiration
  3. 4. the exchange of gases between the atmosphere and the blood
  4. 5. two large tubes that lead to the lungs
  5. 7. liquid part of the blood
  6. 8. prevent blood from flowing backward
  7. 9. the top chambers of the heart
  8. 11. a hollow, muscular organ that pumps blood throughout the body
  9. 13. largest organs in the respiratory system; gas exchange takes place here
  10. 14. released into cell tissue during internal respiration
  11. 15. help the body fight and kill infections