Crosswordd puzzle

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Across
  1. 2. lack of adequate blood supply to the heart
  2. 3. blood cell formation
  3. 6. Blood away from the heart
  4. 8. abnormally shaped hemoglobin
  5. 11. atria contact
  6. 12. consists of 45%,RBC, WBC,platelets
  7. 13. closing of AV valves
  8. 14. contraction of ventricles
  9. 16. Valves prevent blood backflow
  10. 18. high blood pressure
  11. 20. decrease in oxygen-carrying ability of blood
Down
  1. 1. ventricles relaxed
  2. 4. distributes the impulse out to the ventricles
  3. 5. graphic record of heart activity
  4. 7. transports o2 in blood
  5. 9. Walls 1-cell thick
  6. 10. iron-containing protein, binds to o2
  7. 15. defend body against infections and tumors
  8. 17. when sound begins to appear
  9. 19. the SA node is