Across
- 3. vessels that take blood away from the heart
- 5. narrow tubes that lead to lungs
- 6. sacs in lungs where gas exchange occurs
- 9. nerve cells
- 10. vessel that brings blood towards heart
- 11. gap between two neurons
- 13. voice box
- 15. tube air passes through
- 16. buildup of fatty material within artery walls
Down
- 1. chamber of heart where blood enters
- 2. movement of air in and out of lungs
- 4. tiny blood vessels that deliver supplies to cells and take away waste
- 7. main organ of respiratory system
- 8. muscle that moves air in and out of lungs
- 12. chamber of the heart where blood leaves
- 14. tubelike passageway at the top of throat