. True manhood : a manual for young men . are like secretory glands in action andconstruction, being composed of cells, tubes and secretions are used in building up the system,while excretions are poisonous and remain in the sys-tem only long enough to be ejected. The Kidney Glands. The kidneys are excretory glands, two in number,situated just beneath the * small of the back, and areusually inclosed in a large amount of fat. The average size is between fourand five inches in length, two anda half in breadth, and one in thick-ness. The kidney is of a reddishyellow. In construction it
. True manhood : a manual for young men . are like secretory glands in action andconstruction, being composed of cells, tubes and secretions are used in building up the system,while excretions are poisonous and remain in the sys-tem only long enough to be ejected. The Kidney Glands. The kidneys are excretory glands, two in number,situated just beneath the * small of the back, and areusually inclosed in a large amount of fat. The average size is between fourand five inches in length, two anda half in breadth, and one in thick-ness. The kidney is of a reddishyellow. In construction it variessomewhat from the other glands,its cells lying near the surface,while its ducts occupy the interiorand converge toward the center. A plexus of vessels brings bloodto the cells, which with unerringinstinct extracts from them the ex-cretory fluid. Any elements that Fig. XLIV. Section ofare available are taken up by the ; the heat making atoms are taken into thecapillaries, while the utterly useless urine is retained. ,72 TRUE MANHOOD. by the gland, and passed into the bladder throughthe ureters. When a sufficient quantity has accumulated, thevital force gives notice of the presence of the poisonby a pressure on the sensory nerves of the cerebro-spinal system. Thought sends orders down the mo-tor nerves of muscles which attend to the duty of ex-pelling the urine. If thought fails to pay attention to the call of vitalforce, then the lymphatics come to the relief of thebladder and the poison is conveyed to the blood, tobe entered again into the general circulation and causedisease. Bad diet, beer, and other alcoholic drinks cause dis-ease of this gland, by overloading it, as they containno nourishment and cause too hard work and conse-quent injury. The Sweat and Oil Glands. There are some seven millions of minute pores uponthe surface of the skin, visible only through a micro-scope. They are the orifices of as many perspiratoryor sweat glands, tubular in form,
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