why do veins have valves but not arteries ?
Answers
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.) Valves also help blood travel back to the heart against the force of gravity.
Explanation:
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The main function of valve is to prevent backflow of blood.
The blood flows at a very high velocity( high pressure) in the arteries compared to veins( low pressure)
So backflow cannot happen since the heart pumps the blood forcefully into the arteries.
But when the blood comes to the veins from the arteries then the capillaries the velocity is less and may backflow or become stagnant.
But this is prevented by the valves