Question

Veins have valves which allow blood to flow only in one direction. Arteries do not have
valves. Yet the blood flows in one direction only. Can you explain why?

Answer 1

Answer:

The artery have thick elastic walls and arteries receives blood in high pressure directly from the left ventricle. Because of the high pressure flow of blood from the heart and the elasticity of the vessels, they blood flows only in one direction in arteries.

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Answer 2

Answer:

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.