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9 Urine, Regulation and Dialysis WS KEY - Biology 20:...

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Biology 20:THOUGHT LAB: Urine Composition, Osmotic & Body Fluid Regulation, & DialysisKEYThe following table compares the composition of blood plasma, nephric filtrate, and urine. Study itcarefully and answer the questions that follow.Comparison of concentrations of substances in Plasma, Filtrate and Urine (mg/100mL)SubstancePlasmaFiltrateUrineConcentrationChangeInorganic ions(all)0.90.9<0.9 – 3.6<1 – 4K+0.020.020.157.5Amino acids0.050.05noneProteins8.0nonenoneGlucose0.010.01noneUrea0.030.031.8Note: The pH of blood plasma and filtrate is 7.4. The pH of urine is 4.8–7.5.1.Study the concentrations of the ions, the amino acids, glucose and urea. Why are their concentrationsin the filtrate identical to those in the plasma?××60×
2.Neither glucose nor proteins are present in urine, but for different reasons. Explain.
3.Although urea (a waste molecule) undergoes less reabsorption than glucose, its concentration in theurine has increased about 60-fold. Account for the increase.
4.Give two reasons to explain why K+is more concentrated in the urine than in the filtrate.
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