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