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