Vein

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  Phases of venous valves

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  Phases of venous valves in their normal and varicose state.
  This technical description details the functioning of valves in
  healthy veins versus damaged ones. The text explains the
  process of blood reflux, blood accumulation, and the venous
  dilation that characterizes varicose veins.

  

  

  

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  Tricameral pacemaker

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  Tricameral pacemaker. This illustration shows a medical
  device implanted in the heart to regulate the heart rate. The
  system stimulates the atria and ventricles to coordinate the
  contraction between the chambers, improving efficiency in
  cases of heart failure.