1.

Among arteries and veins, which one have valves.... ​

Answer»

Answer:

VEINS carry the blood back to the heart. They're similar to arteries but not as strong or as thick. Unlike arteries, veins contain VALVES that ENSURE blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.)

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