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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. Blood cells in blood vessel, artwork
  4. Coronary artery disease
  5. Anatomy of human circulatory system
  6. Human head with bone, muscles and circulatory system
  7. Heart valve and strings, SEM
  8. Circulatory system and brain, artwork
  9. Microscopic view of blood clotting inside the artery
  10. Schematic of the hypothalamus receiving nerve impulses from the body
  11. Trabeculae carneae in the heart, SEM
  12. The arteries of the brain
  13. Heart disease, artwork
  14. The arteries of the brain
  15. Microscopic view of white blood cells inside blood vessel
  16. Build-up of atherosclerotic plaque in an artery