Tubular Reabsorption & Secretion — Renal Physiology

Tubular Reabsorption & Secretion MCQs: practice questions

Sample Tubular Reabsorption & Secretion multiple-choice questions from Renal Physiology.

1. The transport maximum for glucose reflects:

   • A. Saturation of glucose transporters
   • B. Maximum GFR
   • C. Maximum renal blood flow
   • D. Maximum ADH secretion
   • E. Maximum urine osmolarity

2. Extracellular fluid volume expansion tends to:

   • A. Stop filtration
   • B. Increase proximal tubular reabsorption
   • C. Decrease proximal tubular reabsorption
   • D. Increase aldosterone
   • E. Increase renin

3. Renal tubular secretion of H+ is important for:

   • A. Acid-base regulation
   • B. Glucose absorption
   • C. Protein synthesis
   • D. O2 transport
   • E. Bile production

4. The major driving force for proximal tubular reabsorption is the basolateral:

   • A. Ca2+ ATPase only
   • B. Na+-Cl− cotransporter
   • C. H+-K+ ATPase
   • D. Na+-K+ ATPase
   • E. ENaC

5. The thick ascending limb is relatively impermeable to:

   • A. K+
   • B. Na+
   • C. Water
   • D. Cl−
   • E. Mg2+

6. Glucose enters proximal tubular cells across the luminal membrane by:

7. A substance with zero renal clearance is:

8. Phosphate reabsorption occurs mainly in the:

9. Increased distal tubular flow tends to:

10. A substance that is filtered and secreted but not reabsorbed has a clearance:

11. Approximately what fraction of filtered Na+ is reabsorbed in the proximal tubule?

12. When plasma glucose exceeds the renal transport maximum:

13. Net renal excretion equals:

14. Peritubular capillary oncotic pressure favors:

15. Thiazide diuretics inhibit NaCl reabsorption in the:

16. Glucose exits proximal tubular cells across the basolateral membrane primarily by:

17. Most filtered bicarbonate is reabsorbed in the:

18. Urea is reabsorbed substantially in the:

19. Glucose is normally reabsorbed primarily in the:

20. Carbonic anhydrase is important for renal reabsorption of:

21. Potassium secretion is increased by:

22. Tubular Reabsorption & Secretion 30 questions • Five related options • One best answer • Explanation 1. The largest fraction of filtered Na+ is reabsorbed in the:

23. ADH increases water reabsorption primarily in the:

24. Parathyroid hormone decreases proximal tubular reabsorption of:

25. Loop diuretics increase urinary Ca2+ excretion because they inhibit NaCl reabsorption in the:

26. The Na+-K+-2Cl− cotransporter is located in the:

27. Aldosterone increases:

28. ADH increases collecting duct water permeability by inserting:

29. PTH increases renal reabsorption of Ca2+ primarily in the:

30. Aldosterone acts primarily on the: