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Why is there differences in size and thickness of the different vessels?
Wiki User
â 10y ago
Because of their functions. Arteries have a very thick middle and outer layers because they have to bear the high pressure of blood coming from the heart. The walls of veins are thin because they carry blood at low pressure (but they have valves), and capillaries are only one cell thick because they have to exchange nutrients and wastes with the interstitial fluid.
Wiki User
â 10y ago
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