The diameter of veins is more than the diameter of the arteries, as the wall of veins is thinner than arteries. Also blood flows with high pressure in the arteries than the veins. The arteries carries out blood away from the heart towards the periphery and the veins collects the peripheral blood to the heart.
As the blood flows with high pressure in the arteries and with low pressure in the veins, so if the number of arteries will be similar to the number of veins, than amount of going out from the heart will not be similar to the amount of blood coming to the heart. So, the number of veins are more than the arteries and also the diameter, so that the same amount of blood can be returned to the heart as the amount of blood the heart is pumping.
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