Which of the following has the largest total | vedclass

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(B) The circulatory system consists of arteries,arterioles,capillaries,venules,and veins. Capillaries are the smallest blood vessels,with a diameter o

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Capillaries

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(B) The circulatory system consists of arteries,arterioles,capillaries,venules,and veins. Capillaries are the smallest blood vessels,with a diameter of approximately $8-10 \ \mu m$. Although individual capillaries are very small,they exist in such vast numbers that their combined total cross-sectional area is significantly greater than that of arteries or veins. This massive total surface area is crucial for the efficient exchange of gases,nutrients,and waste products between the blood and the surrounding tissues.

Column-$I$	Column-$II$
$P$. Tunica intima	$I$. Smooth muscle
$Q$. Tunica media	$II$. Squamous epithelium
$R$. Tunica externa	$III$. Fibrous connective tissue

Which of the following has the largest total surface area in the circulatory system?

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Match the following columns:
Column-$I$ Column-$II$
$P$. Tunica intima $I$. Smooth muscle
$Q$. Tunica media $II$. Squamous epithelium
$R$. Tunica externa $III$. Fibrous connective tissue

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