8/16 The coiled parts of the tubes are called _sweat glands_, because they separate from the blood the fluid which we call sweat or perspiration. The Oil Glands.~--There are other little glands in the skin which make fat or oil. The oil is poured out upon the skin to keep it soft and smooth. The Hair.~--There are some curious little pockets in the skin. Out of each of these pockets grows a hair. |