The lumen of a vein is wider because ........

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(D) Blood vessels are composed of three layers: $Tunica$ $interna$ (innermost),$Tunica$ $media$ (middle),and $Tunica$ $externa$ (outermost).In arterie

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The tunica media is a thin layer.

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(D) Blood vessels are composed of three layers: $Tunica$ $interna$ (innermost),$Tunica$ $media$ (middle),and $Tunica$ $externa$ (outermost).In arteries,the $Tunica$ $media$ is very thick and muscular to withstand high blood pressure,which results in a narrow lumen.In contrast,veins have a much thinner $Tunica$ $media$ compared to arteries.Because the $Tunica$ $media$ is thin in veins,the vessel wall is less thick,which allows the lumen to be significantly wider than that of an artery.

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Assertion : When there is a fall in the blood pressure due to loss of blood volume,this is compensated by vasoconstriction of veins.
Reason : Veins hold the extra amount of blood which can be shifted to the arteries as required.

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