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