Urea

safaTerkawi

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2022-08-11

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Urea.

And glucose have similar molar concentrations in normal blood.
Concentration rises in tubular fluid as the glomerular filtrate passes down the nephron.
Is actively secreted by the renal tubular cells into the tubular fluid.
Concentration in blood may rise ten-fold after a high protein meal.
Causes a diuresis when its blood concentration is increased.

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safaTerkawi

2022-08-11

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A. True Both are around 5 mmol/litre.

B. True The urinary concentration of urea is many times that in plasma.

C. False 50 per cent of the filtered urea is passively reabsorbed; the rise in tubular concentration can be explained by the reabsorption of water.

D. False It rises but would not double in concentration.

E. True It causes an osmotic diuresis.

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