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?

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Solution

Veins and arteries:
Arteries are thick-walled when compared to thin-walled veins.
Arteries for this reason carry oxygenated blood which comparatively has high pressure.
Since the blood pressure In this region is high, the blood flows only In one direction.
Veins, on the other hand, are thin-walled and carry deoxygenated blood which comparatively has low pressure.
So since it can flow in the opposite direction as its pressure is low, veins have valves to make sure that there is no backflow of blood.

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