The Respiratory System - Gas Exchange

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