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venous valves

   Also found in: Dictionary/thesaurus, Encyclopedia 0.01 sec.
venous valves,
any of the small cusps or folds found in the tunica intima of many veins, serving to prevent backflow of blood.


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Some people have weak venous valves, in these cases gravity forces large quantities of blood back down into distal parts of the vein.
This condition is thought to result from damage to the delicate venous valves when exposed to the occluding blood clot for time periods greater than a few weeks.
 
 
 
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