1. Swati Kumari
  2. Science 10
  3. Thursday, June 16 2016, 06:57 PM
What are the function of vein ?
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Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure, instead they have valves that ensure that the blood flows only in one direction.
  1. more than a month ago
  2. Science 10
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