Match 'Column A' with 'Column B' in context of the muscular layers in blood vessels.Column A Column B (a) Thick tunica media (i) Vein (b) Smallest vessel diameter (ii) Artery (c) Large lumen (iii) Capillary (d) Endothelium (iv) All blood vessels
a-ii, b-iii, c-i, d-iv
Arteries carry blood away from the heart under high pressure, so their walls have a thick muscular and elastic tunica media that can withstand and modulate pressure. Hence (a) matches (ii) Artery.
Capillaries are the tiniest exchange vessels, only about one red-blood-cell wide, giving them the smallest vessel diameter. Hence (b) matches (iii) Capillary.
Veins carry blood back to the heart at low pressure; they have thin walls and a comparatively large lumen (with valves to prevent backflow). Hence (c) matches (i) Vein.
The endothelium is the single innermost lining of smooth squamous cells present in every blood vessel - arteries, veins and capillaries alike. Hence (d) matches (iv) All blood vessels.
Hence, the correct matching is a-ii, b-iii, c-i, d-iv.
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