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Blood Capillaries. The blood capillaries are where the important functions of the circulation take place: the exchange of material between circulation and cells. Capillaries are the smallest of the body's blood vessels. They are only one cell thick, and they are the sites of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body; they also collect carbon dioxide waste materials and fluids for return to the veins.
(Their diameter is 5 to 10  micrometers, or 5 to 10 millionths of a meter.) Capillaries connect  arterioles and venules, which are the smaller extensions of the  larger arteries and veins. the smallest blood vessels in the body branched off from arteries.A capilary is a small artery.37 people found this useful.t is the smallest blood vessels in the body that carries blood cells ,salts & nutrients to be supplied to tissues & organs. It is a minute(nm) tube that permits flow of min â¦ ute solutions/gas in minimum molecular form.