Answer:
depend on body movement to help move blood along
thin-walled
contain valves to prevent backflow
Explanation:
Veins return deoxygenated blood to the heart. They are thinly walled to allow blood plasma to flow back from tissues. This is after capillaries have brought in oxygenated and nourished blood into interstitial spaces from which exchanges with tissue occurs. The movement of this blood in the veins is assisted by musculoskeletal movements while the vein valves prevent backflow because the blood does not have as much pressure as in the arteries.
