Across
- 2. large tubes that branch to lungs and nose
- 7. Pair of organs exchanging O2 and CO2
- 8. Brings O2 in and CO2 out
- 12. food
- 13. system A system that contains blood vessels
- 15. A tube that connects to the nose and mouth to
Down
- 1. system A group of functioning things
- 2. Air sacs
- 3. system the process of breaking down and
- 4. an organ that holds waste
- 5. an organ that filters blood
- 6. system process of exchanging O2 and CO2
- 9. A working thing that functions in your body
- 10. small blood vessels
- 11. Carries blood away from heart
- 14. cells that are grouped together