An elementary physiology and hygiene for use in upper grammar grades . tch becomes inflamed and painful, or perhapsdevelops a sore or boil. If the germs can be kept out,these sores will not appear. Special care should betaken to wash all cuts and bruises, and to cover themwith a plaster or bandage so as to prevent bacteria fromentering where the epidermis has been broken. As an Excreting Organ.—When we have been takingvigorous exercise, or on a very warm day, small dropsof moisture, or sweat, appear on the forehead, the nose,and other parts of the body. This moisture is secretedby the sweat gl
An elementary physiology and hygiene for use in upper grammar grades . tch becomes inflamed and painful, or perhapsdevelops a sore or boil. If the germs can be kept out,these sores will not appear. Special care should betaken to wash all cuts and bruises, and to cover themwith a plaster or bandage so as to prevent bacteria fromentering where the epidermis has been broken. As an Excreting Organ.—When we have been takingvigorous exercise, or on a very warm day, small dropsof moisture, or sweat, appear on the forehead, the nose,and other parts of the body. This moisture is secretedby the sweat glands, of which we have about two anda half millions in our skin. 164 PHYSIOLOGY AND HYGIENE A sweat gland is too small to be seen with the nakedeye, but it consists of a tube passing through the epi-dermis, and coiled up in a knot on the inside, as shown inFigure 61. This tube secretes the sweat, which passesout through a minute hole in the epidermis, called apore, and is discharged upon the surface of the skin of the whole body is covered with these tiny. Fig. 64. — A Bit of Skin as it appears under a furrows and pores. pores, each leading into a gland. Though they arefound all over the body, there are more of them uponthe forehead, the palms of the hands, and the soles ofthe feet than elsewhere. If we look at the skin of thefingers, we see that it is covered with irregular we compare two fingers, we find that the furrows areunlike. The pores in the skin of the fingers are alongthe ridges between these furrows, as shown in Figure64; they may be seen with a magnifying glass. KIDNEYS AND SKIN AND THEIR DUTIES 165 We notice the sweat only when it appears in dropsupon the surface of the skin, or when it moistens theclothing. It is then being poured out of the glands inespecially large quantities, but the glands are bringingit out all the time. The sweat is usually evaporatedas fast as it comes to the surface, not becoming visible,but simp
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1
