The structure of which of the following consi | vedclass

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(A) Capillaries were discovered by Marcello Malpighi in $1661$. These are very thin-walled because the $tunica$ $externa$ and $tunica$ $media$ are abs

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Blood capillary

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(A) Capillaries were discovered by Marcello Malpighi in $1661$. These are very thin-walled because the $tunica$ $externa$ and $tunica$ $media$ are absent. The capillary wall is formed by only the $tunica$ $interna$ or endothelium,which is a single layer of cells. These connect arterioles to venules and are specialized for exchanging substances with interstitial fluid. According to local tissue requirements,these can be constricted or dilated.

Column-$A$	Column-$B$
$(1)$ Aorta	$(A)$ Carries deoxygenated blood from the heart to lungs
$(2)$ Capillaries	$(B)$ Largest blood vessel
$(3)$ Pulmonary artery	$(C)$ Tiny blood vessels where exchange of gases occurs
$(4)$ Veins	$(D)$ Blood vessels that carry blood back to heart

The structure of which of the following consists of a layer of single cell thickness?

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