The circulatory sysytem

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Across
  1. 3. Between the left atrium and ventricle, prevents backflow.
  2. 4. Receives deoxygenated blood from the body.
  3. 8. Between the right atrium and ventricle, prevents backflow.
  4. 11. Small vessels for nutrient and gas exchange.
  5. 12. Supply the heart muscle with oxygenated blood.
  6. 13. The inner lining of blood vessels that controls exchange of substances between blood and tissues.
  7. 15. Drain deoxygenated blood from the heart muscle.
  8. 16. Largest artery carries blood from the heart to the body.
  9. 17. Controls blood flow from the right ventricle to the lungs.
  10. 19. Brings deoxygenated blood from the upper body to the heart.
  11. 20. Brings deoxygenated blood from the lower body to the heart.
Down
  1. 1. Between the right atrium and ventricle, prevents backflow.
  2. 2. Controls blood flow from the right ventricle to the lungs.
  3. 5. Fibrous cords that connect heart valves to the heart muscles, preventing valve prolapse.
  4. 6. The central organ that pumps blood throughout the body.
  5. 7. Receives oxygenated blood from the lungs.
  6. 9. Blood vessels that return de oxygenated blood back to the heart.
  7. 10. The wall that separates the right and left side of the heart.
  8. 14. Small arteries that regulate blood flow from arteries to capillaries.
  9. 18. Small veins that collect blood from capillaries and carry it to larger veins.