thin-walled blood vessels that are less elastic than arteries; veins contain cup0like valves that keep blood flowing in one direction to the heart and prevent blood from flowing backward. They carry blood containing waste products back to the heart and lungs for cleaning and to pick up oxygen

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1. thin-walled blood vessels that are less elastic than arteries; veins contain cup0like valves that keep blood flowing in one direction to the heart and prevent blood from flowing backward. They carry blood containing waste products back to the heart and lungs for cleaning and to pick up oxygen