Why the vens are provided with wall?why?
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In all complex multicellular organisms (eukaryotes), cell duplication occurs by a process called "mitosis" or cell division. Cells divide for two reasons: Growth. We all started out as a single cell; the fusion of a sperm from dad and an egg from mom.
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veins are provided with valves to prevent the backflow of blood carried by veins. Arteries are thick walled because they need much pressure to pump the blood throughout the body and thick walls provide that pressure. ... The pressure in our arteries is more than in veins as the blood has to reach throughout our body.
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