General Information
ANSWERS
  1. About healthy vein valves
    The valves inside the veins normally close in cycles when the blood flows through them or when pressure is applied from above. Their role is to prevent backflow (reflux) in the vein. Historically, these valves are of great importance because they were the critical clue (in 1628) that proved the circulation is designed to flow in one direction only. When valves fail to work properly the blood does flow back and forth in two directions and the vein no longer functions properly.
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