Across
- 4. valve between right ventricle and pulmonary artery
- 6. the main breathing muscle that contracts to pull air into the lungs
- 8. chamber that pumps deoxygenated blood to the lungs
- 10. chamber that receives oxygenated blood from lungs
- 12. valve between left ventricle and aorta
- 14. blood vessels that return blood to the heart
- 15. system that include heart + blood vessels
- 17. valve between left atrium and left ventricle
- 18. the loop that carries deoxygenated blood from the heart to the lungs and oxygenated blood back
- 19. the loop that carries oxygenated blood from the heart to the body and deoxygenated blood back
Down
- 1. valve between right atrium and right ventricle
- 2. chamber that pumps oxygenated blood to the body
- 3. the air sacs in the lungs where O2 enters the blood and CO2 leaves
- 5. chamber that receives deoxygenated blood from body
- 7. system that includes airways + lungs + diaphragm
- 9. protein in red blood cells that binds and carries O2
- 11. blood vessels that carry blood away from the heart
- 13. tiny vessels where O2, nutrients, and waste are exchanged with body tissues
- 16. paired organs where gas exchange occurs