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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.
Only the microscopic capillaries serve as the location for the exchange of gases and nutrients between blood and tissue cells. The capillary walls are very thin and composed of a single layer of endothelial cells, which are very thin flattened cells that line the inner walls of all of the blood vessels.