A vein differs from an artery in having | vedclass

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(C) Veins differ from arteries primarily because they contain valves. These valves are essential to prevent the backflow of blood,as blood in the vein

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Valves to control direction of flow

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(C) Veins differ from arteries primarily because they contain valves. These valves are essential to prevent the backflow of blood,as blood in the veins flows at a lower pressure compared to the high-pressure flow in arteries. Arteries typically have thicker,more muscular walls and a narrower lumen,whereas veins have thinner walls and a wider lumen.

$A$ vein differs from an artery in having

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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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