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vein

n :  any of the tubular branching vessels that carry blood from the capillaries toward the heart and have thinner walls than the arteries and often valves at intervals to prevent reflux of the blood which flows in a steady stream and is in most cases dark-colored due to the presence of reduced hemoglobin .
 
 

 
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Decatur County Memorial Hospital (Greensburg, Indiana - Decatur County)