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