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The human body has 3 main parts:

  1. The heart
  2. The blood
  3. The blood vessels
Sometimes people count the fluid lymph, and the vessels that carry it in them, parts of the circulatory system.

A few of the parts of the heart are ventricles, arteries, valves, the septum, and the atria. The pumping sound of the heart comes from valves opening and closing.
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12y ago

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