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Veins returning to the heart can close to prevent the backflow of blood. Which component in the veins contributes to this process?
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Veins returning to the heart can close to prevent the backflow of blood. Which component in the veins contributes to this process?

User Supersuraccoon
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the valves are an aid to help prevent backflip and keep circulation a one-way system
User Raz Omessi
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