Assertion : When there is a fall in the blood | vedclass

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(A) Veins are known as capacitance vessels because they contain a large volume of blood (about $60-70\%$ of the total blood volume) at any given time.

Vedclass · Accepted Answer

If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) Veins are known as capacitance vessels because they contain a large volume of blood (about $60-70\%$ of the total blood volume) at any given time.When blood pressure drops due to a decrease in blood volume (e.g.,hemorrhage),the sympathetic nervous system triggers vasoconstriction of the veins.This constriction reduces the capacity of the venous system,forcing the stored blood to move toward the heart and into the arterial system.This mechanism helps to maintain venous return and blood pressure,making the Reason a correct explanation for the Assertion.

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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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.