How does the cardiovascular system work?

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Across
  1. 3. infuse oxygen
  2. 4. irregular heartbeat
  3. 8. ultasound image of the heart
  4. 11. Heart surgery
  5. 13. pumping blood
  6. 14. records heart electrical activity
  7. 15. hardening or narrowing of the arteries
  8. 19. brings blood to the heart
  9. 20. blood pressure
  10. 21. root meaning vessel
  11. 22. prefix meaning slow
Down
  1. 1. suffix meaning inflammation
  2. 2. high blood pressure
  3. 5. myocardial infarction
  4. 6. prefix meaning fast
  5. 7. largest artery in the body
  6. 9. infalmmation of the heart muscle
  7. 10. carry blood
  8. 12. listen to heart and lungs
  9. 13. heart rate
  10. 16. prefix meaning heart
  11. 17. Shortness of breath
  12. 18. failure not pumping blood