Across
- 3. the middle muscular layer of the heart
- 4. these carry blood away from the heart
- 5. valves located between the right ventricle and pulmonary artery
- 7. these help blood flow in one direction in the heart
- 9. microscopic blood vessels
- 12. cavae largest veins in the body
- 14. an organ the size of your fist
- 17. side of the heart that pumps blood to the lungs
- 18. inner lining of the heart
- 19. these vessels carry blood back to the heart
Down
- 1. these valves lie between the right atrium and right ventricle
- 2. the smallest veins
- 6. a two layered sac surrounding the heart
- 8. side of the heart that pumps blood to the rest of the body
- 10. the largest artery in the body
- 11. this system consists of the heart and a close network of blood vessels
- 13. the outer lining of the heart
- 15. the smallest of arteries
- 16. structures that carry blood throughout the body