What are blood vessels composed of?

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(D) Blood vessels,such as arteries and veins,are composed of three distinct layers: $1$. $Tunica$ $intima$: The innermost layer,which consists of a li

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Layers of endothelium,connective tissue,and muscle fibers

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(D) Blood vessels,such as arteries and veins,are composed of three distinct layers: $1$. $Tunica$ $intima$: The innermost layer,which consists of a lining of squamous endothelium. $2$. $Tunica$ $media$: The middle layer,which consists of smooth muscle fibers and elastic fibers. $3$. $Tunica$ $externa$ $(adventitia)$: The outermost layer,which is composed of fibrous connective tissue. Therefore,blood vessels are composed of all three components: endothelium,muscle fibers,and connective tissue.

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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