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  2. Quick Facts: Heart and Blood Vessel Disorders/
  3. Biology of the Heart and Blood Vessels/
    Biology of the Heart and Blood Vessels
    • Biology of the Heart
      • What is the heart?
      • How does the heart work?
        • What are the heart chambers?
        • What are heart valves for?
        • What is the heart's electrical system?
        • Why does the heart need blood vessels?
      • What can go wrong with the heart?
    • Biology of the Blood Vessels
      • What are blood vessels?
      • What can go wrong with blood vessels?
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