. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 358 HUMAN PHYSIOLOGY replacing it with oxygen. This is accompanied by a change of color from purple (in blood which is poor in oxygen) to that of bright red (in richly oxygenated blood). Other changes take place in other parts of the body. In the muscles the blood gives up food and oxygen, receiving carbon dioxide in return. In the liver, the blood gives up its sugar. In glands, it gives up materials used by the gland cells in their manufacture of secretions. In the kidneys, it loses water
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 358 HUMAN PHYSIOLOGY replacing it with oxygen. This is accompanied by a change of color from purple (in blood which is poor in oxygen) to that of bright red (in richly oxygenated blood). Other changes take place in other parts of the body. In the muscles the blood gives up food and oxygen, receiving carbon dioxide in return. In the liver, the blood gives up its sugar. In glands, it gives up materials used by the gland cells in their manufacture of secretions. In the kidneys, it loses water and nitrogenous wastes (urea). In the skin, it also loses some waste materials and water. Function of Lymph. — Different tissues and organs of the body are traversed by a network of tubes which carry the blood. Inside these tubes is the blood proper, consisting of a fluid plasma, the colorless corpuscles, and the red corpuscles. Outside the blood tubes, in spaces be- tween the cells which form tis- sues, is found another fluid very much like plasma of the blood in chemical composition. This is the lymph. It is, in fact, a fluid food in which some color- less amoeboid corpuscles are found. Blood gives much of its food material to the lymph. This it does by passing it through the walls of the capillaries. The food is in turn given up to the tissue cells which are bathed by the lymph. Some of the amoeboid corpuscles from the blood make their way between the cells forming the walls of the capillaries. Lymph, then, is practically blood-plasma plus some colorless corpuscles. It acts as the medium of exchange between the blood proper and the cells in the tissues of the body. It not only gives food to the cells of the body but also takes away vv^aste materials, which are ulti- mately passed out of the body by means of the skin and kidneys. Lymph Vessels. — The lymph is collected from the various tissues of the body by means of a number of very thin-walled tubes, which are at first
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