The Respiratory System - Gas Exchange

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