___ 1) What is the most concentrated urine that can be produced by the kidney, and why? a. 50 mOsm, the osmolarity of urine when ADH is not present b. 100 mOsm, the osmolarity of the fluid in the distal tubule c. 300 mOsm, the osmolarity of filtrate and blood d. 1200 mOsm, the osmolarity in the deep renal medulla ___ 2) How does the nephron deal with glucose? a. Glucose is not filtered. b. Glucose is filtered but then neither reabsorbed nor secreted. c. Glucose is filtered and reabsorbed. d. Glucose is filtered and secreted. ___ 3) Which line represents the addition of ADH but not aldosterone to the simulation? | | Potassium Conc. in Urine (mOsm) | Urine Volume (ml) | Urine Conc. (mOsm) | |---|---|---|---| | A | 6.25 | 201.00 | 100 | | B | 10.42 | 180.90 | 100 | | C | 62.37 | 16.86 | 1200 | | D | 65.37 | 12.67 | 1200 |
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Sri K.
The following table shows the concentration of various solutes in the blood plasma entering the kidney, glomerular filtrate, and urine of a man. Solute Concentration of solute (g/ 1000 cm3) Blood plasma entering the kidney Glomerular filtrate Urine excreted by the kidney Urea 0.25 0.25 20.00 Glucose 1.00 1.00 0.00 Protein 70.00 0.20 0.00 Na+ ion 3.00 3.00 3.00 Cl- ion 3.50 3.50 6.00 SO42- ion 1.00 1.00 1.00 Name the process by which dissolved nutrients in blood plasma enter the Bowman's capsule. (1 mark) i. Explain why very little protein is found in the glomerular filtrate. (2 marks) ii. Explain why glucose is not found in the urine excreted. (1 mark) Explain briefly two ways by which urine is concentrated during its formation in the kidney. (4 marks) What is the immediate effect on urine formation if the man drinks one liter of seawater? (2 marks)
Which of the following is most directly responsible for concentrating urine in the kidney? A. Loop of Henle B. Proximal convoluted tubule C. Bowman's capsule D. Medulla 2. A scientist is studying a normally functioning nephron in an adult human. He examines the filtrate as it moves through the ascending limb of the loop of Henle. What observation is he most likely to make? A. The filtrate becomes less concentrated as it moves up the loop because the ascending limb is permeable to salt B. The filtrate becomes less concentrated as it moves up the loop because the ascending limb is permeable to water C. The filtrate becomes more concentrated as it moves up the loop because the ascending limb is permeable to salt D. The filtrate becomes more concentrated as it moves up the loop because the ascending limb is permeable to water
Caryl A.
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