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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.
Despite their small size, platelets have a greater variety of functions than any of the true blood cells: They secrete vasoconstrictors, stimulating spasmodic constriction of broken vessels and thus help reduce blood loss. They stick together to form temporary platelet plugs that seal small breaks in injured blood vessels.