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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 anatomy, 19th Century illustration
  7. Heart attack, artwork
  8. Pulmonary veins and arteries. circulation, cardiovascular system
  9. Human body showing heart and main circulatory system position
  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. Heart anatomy, 18th century
  18. Coronary artery disease
  19. Blood clot, SEM
  20. Anatomy of human circulatory system
  21. Heart anatomy, 19th Century illustration
  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. Anatomy diagram showing crucial veins in human head and neck
  28. Arterial embolism
  29. Veins of the posterior abdominal wall. cardiovascular system
  30. Circulatory system and brain, artwork
  31. Arteries of the posterior abdominal wall. cardiovascular system
  32. Circulatory system and brain, artwork
  33. Human upper body showing bones, lungs and circulatory system
  34. Microscopic view of blood clotting inside the artery
  35. Transverse section of an artery. cardiovascular system, circulatory system
  36. The arteries of the brain
  37. Heart disease, artwork
  38. Artwork of the respiratory system of an asthmatic
  39. Heart anatomy, 19th Century illustration
  40. Illustration of coronary artery atherosclerosis
  41. Artwork of cerebral embolism, cause of stroke
  42. Cross section of human heart
  43. Artwork of lung oedema in heart failure
  44. Artwork of bronchodilator action in asthma
  45. The arteries of the brain
  46. Microscopic view of white blood cells inside blood vessel
  47. Build-up of atherosclerotic plaque in an artery
  48. Blood vessel anatomy