Respiratory System
Across
- 2. when we take out carbondioxide
- 3. Small air pockets or sacs.
- 5. Sheet of muscles
- 6. when we take oxygen in
- 8. Trachea divided into two branches
Down
- 1. Gas we take out
- 4. Wind pipe is also called
- 7. Two spongy organs
- 9. Gas we take in