haemoglobin is a type of a) large lumen (b) no endothelium (c) thick muscular walls (d) valves
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Explanation:
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Heyaa...
According to me, it's a Red blood cell because endothelium is a thin membrane that lines in the blood vessels..and usually Arteries have thick muscular walls ...and valves actually help in preventing the backward flow of blood..so I think red blood cell is correct..
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