Cardiovascular System

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Across
  1. 3. backflow and repump
  2. 5. sound made by backflow of blood
  3. 7. pumps blood
  4. 11. receiving chambers
  5. 12. delivers oxygen and nutrients and removes C02 etc.
  6. 14. fills space between the layers of pericardium
  7. 15. allows blood to circulate to all parts of the body
Down
  1. 1. valves between ventricle and artery
  2. 2. stiff;heart workload increased
  3. 4. between atria and ventricles
  4. 6. double serous membrane
  5. 8. discharging chambers
  6. 9. made of three layers
  7. 10. prevent backflow
  8. 13. first heart tone(S2)
  9. 16. second heart tone(S1)