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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 anatomy ,artwork
  4. Red blood cells and molecules, artwork
  5. Human blood cells, SEM
  6. Blood cells in blood vessel, artwork
  7. Blood clot, SEM
  8. Anatomy of human circulatory system
  9. Structure of a human heart, artwork
  10. Human head with bone, muscles and circulatory system
  11. Heart valve and strings, SEM
  12. Circulatory system and brain, artwork
  13. Circulatory system and brain, artwork
  14. Microscopic view of blood clotting inside the artery
  15. Schematic of the hypothalamus receiving nerve impulses from the body
  16. Trabeculae carneae in the heart, SEM
  17. Cross section of human heart
  18. Microscopic view of white blood cells inside blood vessel
  19. Cut artery, artwork