Problem Set IV - + /ml. a. What is the daily excretion of...

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1 Problem Set IV: Kidney Function 1) The following data were collected from a mammal. Renal blood flow . .................... 64.6 L/h Glomerular filtration rate . ........ 400 ml/min Total salt secretion . ................. 10.5 mg/min Rate of fluid reabsorption . ...... 398.5 ml/min What is the rate of urine production in this animal? 2) The following data were collected from a bird: Total evaporative water loss rate . ...... 400 ml/h Total urinary water loss . .................... 100 ml/h Metabolic water production . .............. 8 ml/h Rate of water ingestion in food . ......... 408 ml/h How much water does this bird have to drink to remain in water balance? 3) Suppose a toad excretes 100 ml of urine per day, and the urine contains 2 μmole Na
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Unformatted text preview: + /ml. a. What is the daily excretion of sodium? b. Suppose we measure the plasma concentration of sodium and find it to be 100 μmole/ml. Calculate the plasma clearance for sodium. c. If the measured inulin clearance in the toad is 6 ml/h, decide whether sodium is being reabsorbed or secreted during passage through the kidneys. (Inulin is a fructose polysaccharide that is freely filtered and undergoes no modification of concentration by reabsorption or secretion anywhere in the kidney tubules.) d. If sodium is freely filtered, what fraction of the amount filtered is actually excreted? e. What is the glomerular filtration rate (GFR) in the toad?...
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This note was uploaded on 08/24/2011 for the course PCB 4723C taught by Professor Julian during the Fall '08 term at University of Florida.

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