Across
- 1. blood vessel flowing toward the heart
- 2. membranous sheath
- 4. outermost wall of blood vessel
- 7. inside width of a vessel
- 10. shaped like a crescent
- 11. epithelial cell lining of vessel
- 14. blood vessel flowing away from heart
- 15. muscular layer of the heart
- 16. network of blood vessels interacting with cells
- 18. pointed bottom of the heart
Down
- 1. prevent retrograde flow of blood
- 2. having 3 valves
- 3. branch of medicine that studies vascular structures
- 5. lower chambers of the heart
- 6. innermost lining
- 8. partition separating right and left sides of heart
- 9. low in amount of oxygen
- 12. main artery in body carrying oxygenated blood
- 13. mitral valve
- 15. muscle layer of vessel
- 17. upper chambers of the heart