awilliams2308 awilliams2308
  • 30-03-2018
  • Biology
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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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snv0129
snv0129 snv0129
  • 31-03-2018
the valves are an aid to help prevent backflip and keep circulation a one-way system
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