Question

why veins have valves and arteries don't have

Answer 1

Unlike arteries, veins contain valvesthat ensure blood flows in only one direction. (Arteries don't require valvesbecause pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.

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Answer 2

Hey friend,

Good Morning.. :)

Here is your answer.. :)

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The main function of the valves in veins is to prevent back flow of blood. Blood in the arteries, after being pumped by the heart, are under much higher pressure than blood in veins, so there is no need for valves in arteries to prevent back flow.

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Hope this will help you.. :)