منابع مشابه
Mechanism of Urea Excretion
1. Urea is present in the cells of the proximal convoluted tubule in a concentration higher than that of the blood or than that of the cells of any of the other kidney tubules. 2. Such a condition can only be reconciled to an assumption of an active secretion (excretion) on the part of these cells. 3. Urea also passes through the glomerular filter with the other crystalloids of the blood plasma...
متن کاملUrea and creatinine excretion
Plasma urea and creatinine concentrations and urea and creatinine clearances and excretion were measured in a sample of 40 infants of 25*5-33 weeks' gestation, birth weight 720-2000 g, between the ages of 0 5 and 33 days. Creatinine excretion rate was between 60 and 120 gmol/kg/day in the first five postnatal weeks (mean 90.5) and was independent of sex or growth retardation. This can be used i...
متن کاملStudies of Urea Excretion. Ix. Comparison of Urea Clearances Calculated from the Excretion of Urea, of Urea plus Ammonia, and of Nitrogen Determinable by Hypobromite.
According to the usually accepted concept, the urea removed from the blood by the kidneys is excreted in two forms, chiefly as urea itself, but partly as ammonia. That the ammonia of the urine is formed in the kidneys was demonstrated by Nash and Benedict (1921), in work which has been confirmed by other authors (cf. Peters and Van Slyke, I, p. 373). Evidence from animal experiments in v4vo has...
متن کاملThe Rate of Urea Excretion. Vii. the Effect of Various Other Factors than Blood Urea Concentration on the Rate of Urea Excretion.* by T. Addis
tions a constant (1). If now these conditions are all complied with, but in addition some new factor is introduced, the effect on the rate of urea excretion can be measured by the deviation of the ratio from its constant value. Most of the experiments given in this paper were carried out on the two subjects, Add. and Dru., whose ratios under standard conditions are given in Paper V of this seri...
متن کاملThe Rate of Urea Excretion. Iii. the Effect of Changes in Blood Urea Concentration on the Rate of Urea Excretion. by T. Addis and C. K. Watanabe
On one side of the urea-secreting cells of the kidney there is blood and on the other side there is urine. The rate of urea excretion is the rate at which these cells transfer urea from blood to urine. Under these circumstances it seems probable that changes in the concentration of urea in the ,blood will have an effect on the rate of urea excretion. If the concentration of urea in the blood we...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1946
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1946.sp004167