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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. Heart and Brain
  4. Pulmonary veins and arteries. circulation, cardiovascular system
  5. Anatomy of human body and circulatory system, front view
  6. Veins and nerves of the neck. cardiovascular system, nervous system
  7. Human foot anatomy showing skin, veins, arteries, muscles and bones
  8. Anatomy of human circulatory system
  9. Superficial arteries and veins of face and scalp. cardiovascular system
  10. Human head with bone, muscles and circulatory system
  11. Arterial embolism
  12. Anatomy diagram showing crucial veins in human head and neck
  13. Veins of the posterior abdominal wall. cardiovascular system
  14. Arteries of the posterior abdominal wall. cardiovascular system
  15. Microscopic view of blood clotting inside the artery
  16. Human upper body showing bones, lungs and circulatory system
  17. Schematic of the hypothalamus receiving nerve impulses from the body
  18. Blood vessel anatomy
  19. Build-up of atherosclerotic plaque in an artery
  20. Heart with arteries showing cholesterol in one and plaque in the other