The Respiratory System - Gas Exchange

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Across
  1. 3. The place where carbon dioxide is dropped off
  2. 5. Carbon dioxide travels out of your body when you -
  3. 6. The circulatory system __ gases where they need to go
  4. 7. The number of hours in a day the respiratory system works
  5. 9. The respiratory and circulatory are __ because they need each other.
  6. 11. Your own body's gas exchange program
  7. 14. The system that carries oxygen to your cells
Down
  1. 1. Your chest changes size when you -
  2. 2. The respiratory system includes your lungs, nose, mouth and air __.
  3. 4. A waste product in your blood
  4. 8. A large muscle under your lungs that pulls down
  5. 10. Air enters this tube when you inhale air
  6. 12. Enters your lungs when you take a breath of air
  7. 13. The tiny sacs on the small tubes in your lungs