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  1. Electrical conduction in the heart controlled by pacemaker cells in the sinoatrial node.
  2. Anatomy of human body and circulatory system, front view
  3. Human foot anatomy showing skin, veins, arteries, muscles and bones
  4. Anatomy of human circulatory system
  5. Human head with bone, muscles and circulatory system
  6. Microscopic view of blood clotting inside the artery
  7. Human upper body showing bones, lungs and circulatory system
  8. Schematic of the hypothalamus receiving nerve impulses from the body
  9. Build-up of atherosclerotic plaque in an artery
  10. Blood vessel anatomy
  11. Heart with arteries showing cholesterol in one and plaque in the other