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  1. Electrical conduction in the heart controlled by pacemaker cells in the sinoatrial node.
  2. Cross-section of human heart. cardiovascular system
  3. Human heart, artwork
  4. Human anatomy ,artwork
  5. Human body showing heart and main circulatory system position
  6. Rib cage and heart, 3D CT scan
  7. Cardiovascular system, artwork
  8. Human foot anatomy showing skin, veins, arteries, muscles and bones
  9. Coronary artery disease
  10. Circulatory system, 17th century
  11. Structure of a human heart, artwork
  12. Trabeculae carneae in the heart, SEM
  13. The arteries of the brain
  14. Illustration of coronary artery atherosclerosis
  15. Heart disease, artwork
  16. Heart with coronary vessels, artwork
  17. Artwork of lung oedema in heart failure
  18. Build-up of atherosclerotic plaque in an artery
  19. Blood vessel anatomy
  20. Coronary Blood Clot, SEM