Question

Veins have valves which allows blood to flow only in One Direction.Arteries do not have valves yet the blood flows in One Direction only.Can you explain why?

Fastest answer with explanation will be the brainliest.....
No silly answers.....
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Answer 1

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.)

Explanation:

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Answer 2

I have explained in 3 ways so that you understand perfectly.

1.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.) Valves also help blood travel back to the heart against the force of gravity.

2.Veins have valves because blood flows with less pressure and there are chances that it comes back.  Thus to prevent blood from coming back it has valves whereas in arteries blood flows at high pressure so it won't come back.  Thus, it doesn't have valves.

3.The walls of arteries are thick on the other hand the walls of veins are thinner so the pressure exerted by the blood on veins will be more. so the valves present in the veins prevent the back flow of blood (deoxygenated blood).

Hope it's helpful!!!!