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It allow food and gases in body
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Capillaries are thin walled because they have to let the gases diffuse. Oxygen and CO2 needs to pass through their walls.

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A single Capillary is so small that it allows only one small that it allows only one blood cell to flow through it at a time. The capillary walls are thin and small, only one cell is thick. These thin walls easily allow water, oxygen, carbon dioxide, and other nutrient and waste substances to exchange blood cells and the surrounding tissue. 

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CAPILLARIES ARE THIN WALLED BECAUSE MOLECULES SUCH AS FATS ,LIPIDS ,OXYGEN AND WATER HAVE TO PASS THROUGH THE THIN WALLS BY THE PROCESS OF DIFFUSION.

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It's answer is like why blue things are blue. Some questions upon something can not be made because it is like unquestionable.
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Capillaries are thin to aid in the process of diffusion and easy exchange of materials.
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The function of capillary is to allow food and oxygen to diffuse to cells while waste is diffused from cells.They have thin walls so that they can perform effectively.

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Arteries divide further to form capillaries. Capillaries are thin tubes which allow exchange of substances bewteen blood and cells. They are very thin as it facilitates easy exchange through such a thin surface.

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