Chapter 26 Urine Formation by the Kidneys: I. Glomerular Filtration, Renal Blood Flow, and Their Control

Chapter 26  Urine Formation by the Kidneys: I. Glomerular Filtration, Renal Blood Flow, and Their Control

Complete Chapter Questions And Answers
 

Sample Questions

10. What is the net renal tubular reabsorption rate of potassium in the patient described in question 7?
A. 0.280 mmol/min
B. 0.140 mmol/min
C. 0.060 mmol/min
D. 0.030 mmol/min
E. Potassium is not reabsorbed in this example.

ANS: B

11. A 22-year-old female patient complaining of headaches presents to your office. An examination reveals that her blood pressure is 180/118 mmHg, and laboratory tests give the following results:
Plasma renin activity = 14.5 (normal = 1.0)
Plasma Na+ = 142 mmol/L
Plasma K+ = 2.9 mmol/L
Magnetic resonance imaging of the kidneys suggests that she has a renin-secreting tumor in her left kidney. Compared with normal, which one of the following sets of conditions would you expect?
Renal Glomerular Capillary Filtration Peritubular Capillary
Blood Flow Hydrostatic Pressure Fraction Hydrostatic Pressure
A.
B.
C.
D.
E.

ANS: B

12. Which of the following substances would be filtered most readily by the glomerular capillaries?
A. Neutral dextran with a molecular weight of 25,000
B. Polycationic dextran with a molecular weight of 25,000
C. Polyanionic dextran with a molecular weight of 25,000
D. Albumin in plasma
E. Red blood cells

ANS: B

13. Compared with normal conditions, which one of the following sets of changes would you expect to find in a patient with acute proximal tubular necrosis and marked reduction of proximal tubular sodium chloride reabsorption?
Loop of Henle GFR AfferentArteriolar Renal Blood
Sodium Reabsorption Resistance Flow
A.
B.
C.
D.
E.

ANS: A

14. If the average hydrostatic pressure in the glomerular capillaries is 55 mmHg, the hydrostatic pressure in Bowman’s space is 15 mmHg, the average colloid osmotic pressure in the glomerular capillaries is 30 mmHg, and there is no protein in the glomerular ultrafiltrate, what is the net pressure driving glomerular filtration in this example?
A. 0 mmHg
B. 5 mmHg
C. 10 mmHg
D. 15 mmHg
E. 25 mmHg
F. 45 mmHg

ANS: C

15. Which of the following changes would you expect to find after administration of a vasodilator that selectively reduced afferent arteriolar resistance
Renal GFR Glomerular Peritubular
Blood Flow Capillary Capillary
Hydrostatic Hydrostatic
Pressure Pressure
A.
B.
C.
D.
E.
F.

ANS: C