Organism And Environment As Illustrated By the Physiology of Breathing
Organism And Environment As Illustrated By the Physiology of Breathing
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Let us now compare the secretion of oxygen with that of other substances by other secreting glands. In the case of the kidney, various salts and crystalloid substances, particularly urea, are actively secreted by the gland cells, so that their concentration in the urine is far greater than in the blood. For instance there is usually about ten or fifteen times as much urea in a given volume of urine as in the same vol- ume of blood, and when the kidneys secrete sugar there may be twenty or thirt...y times as much sugar in the urine as in the blood. Here then we have other cases of the flow of one kind of molecules being accel- erated* in one direction. In the kidney secretion we also see that the acceleration may be in either direc- tion, and that it depends upon the molecular concen- trations in the liquids on the two sides of the secreting Digitized by VjOOQ IC REGULATION OF ENVIRONMENT 65 cells. We cannot by any means force up indefinitely the concentration of a substance in the urine; and if the concentration in the blood of a constituent of urine falls below a certain point, the secretion of that con- stituent ceases.
What to read after Organism And Environment As Illustrated By the Physiology of Breathing?
You can find similar books in the "Read Also" column, or choose other free books by Haldane, J. S. (John Scott), 1860-1936 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Let us now compare the secretion of oxygen with that of other substances by other secreting glands. In the case of the kidney, various salts and crystalloid substances, particularly urea, are actively secreted by the gland cells, so that their concentration in the urine is far greater than in the blood. For instance there is usually about ten or fifteen times as much urea in a given volume of urine as in the same vol- ume of blood, and when the kidneys secrete sugar there may be twenty or thirt...y times as much sugar in the urine as in the blood. Here then we have other cases of the flow of one kind of molecules being accel- erated* in one direction. In the kidney secretion we also see that the acceleration may be in either direc- tion, and that it depends upon the molecular concen- trations in the liquids on the two sides of the secreting Digitized by VjOOQ IC REGULATION OF ENVIRONMENT 65 cells. We cannot by any means force up indefinitely the concentration of a substance in the urine; and if the concentration in the blood of a constituent of urine falls below a certain point, the secretion of that con- stituent ceases.
What to read after Organism And Environment As Illustrated By the Physiology of Breathing?
You can find similar books in the "Read Also" column, or choose other free books by Haldane, J. S. (John Scott), 1860-1936 to read onlineMoreLess
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