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Asked by twinkles to Chris on 16 Mar 2010 in Categories: Theories.
Question: What are valves?
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Chris Cooper answered on 16 Mar 2010:
In veins they are things that allow blood to flow in one direction only.
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Asked by twinkles to Chris on 16 Mar 2010 in Categories: Theories.Question: What are valves?
Chris Cooper answered on 16 Mar 2010:
In veins they are things that allow blood to flow in one direction only.
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