Across
- 3. largest single artery in the body
- 9. two upper chambers of the heart
- 10. carry blood away from the heart
- 12. valve between right atrium and right ventricle
- 13. endotheliumderived relaxing factor
- 14. middle muscular layer of heart muscle
- 16. prevent the backflow of blood
Down
- 1. four partitions that separate the heart
- 2. smooth layer of epithelial cells lining interior of heart and heart valves
- 4. oxygen-rich
- 5. two lower chambers of the heart
- 6. artery leading from heart to lungs
- 7. carry blood toward the heart
- 8. valve between left atrium and left ventricle
- 11. smaller branches of arteries
- 15. arteries that supply blood to head and neck