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. Biology and man. Biology; Human beings. idermis Fat glands Capillaries Dermis SECTION OF THE SKIN The sweat gland consists of a fine tubule opening to the surface of the skin at one end and coiled up in a knot at the other. The coiled portion is surrounded by blood vessels from which water, salts, and traces of urea are withdrawn into the gland tube. Around the base of each hair ore fat glands. Sensitive nerve endings come close to the surface directly through the lining cells, in part carried by the white corpuscles (see page 188), and in part through the secretions of the liver. From the i

. Biology and man. Biology; Human beings. idermis Fat glands Capillaries Dermis SECTION OF THE SKIN The sweat gland consists of a fine tubule opening to the surface of the skin at one end and coiled up in a knot at the other. The coiled portion is surrounded by blood vessels from which water, salts, and traces of urea are withdrawn into the gland tube. Around the base of each hair ore fat glands. Sensitive nerve endings come close to the surface directly through the lining cells, in part carried by the white corpuscles (see page 188), and in part through the secretions of the liver. From the i Stock Photo
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Library Book Collection / Alamy Stock Photo

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RHK40K

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7.1 MB (532.1 KB Compressed download)

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1746 x 1430 px | 29.6 x 24.2 cm | 11.6 x 9.5 inches | 150dpi

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. Biology and man. Biology; Human beings. idermis Fat glands Capillaries Dermis SECTION OF THE SKIN The sweat gland consists of a fine tubule opening to the surface of the skin at one end and coiled up in a knot at the other. The coiled portion is surrounded by blood vessels from which water, salts, and traces of urea are withdrawn into the gland tube. Around the base of each hair ore fat glands. Sensitive nerve endings come close to the surface directly through the lining cells, in part carried by the white corpuscles (see page 188), and in part through the secretions of the liver. From the intes- tine these substances are removed, together v^^ith the refuse from the food, in the feces. Sweat is excreted by special glands which open on the surface of the skin (see illustration above). The water part of the perspiration usually evaporates as fast as it comes out of the glands, leaving a solid deposit of the wastes. When perspiration is more rapid, we can see the drops of sweat on the skin. When this dries, the solids are left on the outside of the skin, in- stead of in the mouths of the tubules. Ordinarily we perspire from 400 to 750 cubic centimeters daily. The sweat contains about 2 per cent of solids. Thus miners and other laborers who sweat excessively lose some of the essential materials of the body. They need to perspire freely to keep the body cool. But they need also to increase intake of water and salt to com- pensate for the materials lost through the sweat glands (see page 195). 217. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-. Boston, New York, [etc. ] Ginn and company

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