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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 heart, artwork
  4. Cardiovascular system, historical artwork
  5. Heart and Brain
  6. Heart attack, artwork
  7. Human body showing heart and main circulatory system position
  8. Pulmonary veins and arteries. circulation, cardiovascular system
  9. Heart anatomy, 19th Century illustration
  10. Red blood cells and molecules, artwork
  11. Anatomy of human body and circulatory system, front view
  12. Veins and nerves of the neck. cardiovascular system, nervous system
  13. Human heart, artwork
  14. Blood cells in blood vessel, artwork
  15. Cardiovascular system, artwork
  16. Human foot anatomy showing skin, veins, arteries, muscles and bones
  17. Coronary artery disease
  18. Heart anatomy, 18th century
  19. Blood clot, SEM
  20. Heart anatomy, 19th Century illustration
  21. Anatomy of human circulatory system
  22. Superficial arteries and veins of face and scalp. cardiovascular system
  23. Structure of a human heart, artwork
  24. Internal view of the human heart
  25. Human head with bone, muscles and circulatory system
  26. Arterial supply and venous drainage of the organs.
  27. Arterial embolism
  28. Anatomy diagram showing crucial veins in human head and neck
  29. Circulatory system and brain, artwork
  30. Veins of the posterior abdominal wall. cardiovascular system
  31. Circulatory system and brain, artwork
  32. Arteries of the posterior abdominal wall. cardiovascular system
  33. Microscopic view of blood clotting inside the artery
  34. Human upper body showing bones, lungs and circulatory system
  35. Transverse section of an artery. cardiovascular system, circulatory system
  36. The arteries of the brain
  37. Artwork of the respiratory system of an asthmatic
  38. Heart anatomy, 19th Century illustration
  39. Illustration of coronary artery atherosclerosis
  40. Heart disease, artwork
  41. Artwork of cerebral embolism, cause of stroke
  42. Cross section of human heart
  43. Artwork of lung oedema in heart failure
  44. The arteries of the brain
  45. Microscopic view of white blood cells inside blood vessel
  46. Artwork of bronchodilator action in asthma
  47. Build-up of atherosclerotic plaque in an artery
  48. Blood vessel anatomy