Cardiovascular System

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