STUDIES OF UREA EXCRETION

Studies 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...

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...

Urea 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...

Renal regulation of urea excretion in sheep.

SCHMIDT-NIELSEN, BODIL, HCMIO OSAKI, H. V. MURDAVGH, JR. AND ROBERTA O’DELL. Renal regulation of urea excretion in slzeep. Am. J. Physiol. 194(2): 221-228. Ig58.-In order to elucidate the renal mechanism for the regulation of urea excretion the urea clearance and the GFR were studied in sheep during normal and low protein intake in a range of urine flows from extreme osmotic diuresis to minimal...

STUDIES OF UREA EXCRETION: VI. Comparison of the Blood Urea Clearance with Certain Other Measures of Renal Function.