Structures of the Heart

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Across
  1. 2. Where blood is pumped towards the lungs;branches off the pulmonary trunk
  2. 3. Where blood is pumped out of the heart and towards the lungs
  3. 6. Has the thickest walls of them all; pumps blood out to the body
  4. 9. Outermost layer of the heart
  5. 10. Squeezes to pump blood into lungs
  6. 13. Cardiac muscle layer forming the bulk of the heart
  7. 15. Smallest blood vessel in the cardiovascular system
  8. 16. Separates the ventricles
  9. 17. Pumps oxygenated blood to every tissue in the body
  10. 18. Prevents backflow of blood into right ventricle
Down
  1. 1. Prevents backflow of blood into the right atrium
  2. 4. Prevents back-flow of blood into the left atrium
  3. 5. Delivers deoxygenated blood to the heart
  4. 7. The atria that receives blood from the pulmonary veins
  5. 8. Layer that prevents friction between the blood and the inner walls of the heart
  6. 11. Brings back oxygenated blood from the lungs to the heart
  7. 12. Atria that receives deoxygenated blood
  8. 14. Prevents backflow of blood into left ventricle
  9. 19. Where blood becomes freshly oxygenated