Across
- 2. Smallest vessels, they exchange o2 and CO2.
- 5. This is where the circulatory system interacts with the respiratory system.
- 6. A system that exchanges O2 and CO2.
- 7. The basic unit of all living things.
- 9. Carry blood away from the heart.
- 11. A group of organ that work together
- 13. The main organs of the respiratory system.
- 15. Pumps blood and has 4 chambers.
- 16. A group of different tissues that form a structure.
Down
- 1. A muscle that moves up and down to bring air into the lungs.
- 3. The first place air enters.
- 4. A system that moves blood though the body.
- 8. Blood with little oxygen
- 10. Carries air from the mouth to the lungs.
- 12. A group of cells that work together.
- 14. Carry blood back to the heart.
- 16. Blood with lots of oxygen