The Respiratory System
Across
- 2. a muscle between the chest and the abdomen
- 5. air passages inside the lungs.
- 6. it's also called your windpipe.
- 9. A part of your face above the mouth.
- 10. a network of tiny blood vessels
- 11. Otherwise known as O2
Down
- 1. the movement of molecules in a fluid
- 3. What allows us to breathe
- 4. tiny air sacs
- 5. any of the major air passages of the lungs
- 7. A curved bone attached to the spine.
- 8. dioxide known as Co2