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The purpose of capillary tubes is to: permit oxygen and nutrients to be absorbed by cells allow blood to complete a path between arteries and veins reverse the flow of blood provide a means for cell wastes to enter the blood stream


The capillary tubes are designed to serve several important functions. Firstly, they facilitate the absorption of crucial oxygen and nutrients by cells. Secondly, they allow for the completion of the blood's journey between the arteries and veins. Thirdly, they can even reverse the flow of blood in certain circumstances. Finally, they provide an avenue for cell waste to enter the bloodstream. The thinness of the capillary walls - consisting of only one cell - makes it possible for blood to efficiently utilize and transport oxygen and other essential nutrients to the various regions of the body.