Which one of the following statements is true about the proximal tubule.
A. the Na+/K+ ATPase drives sodium into the cell from the urine side of the tubule
B. Na+/H+ exchange is largely the mechanism by which hydrogen ion secretion occurs
C. bicarbonate reabsorption is independent of carbonic anhydrase activity
D. the pH in the lumen of the proximal tubule can reach as low as about 5.0
Answer:B
Which one of the following statements is true about the proximal tubule.
A. the Na+/K+ ATPase drives sodium into the cell from the urine side of the tubule B. Na+/H+ exchange is largely the mechanism by which hydrogen ion secretion occurs C. bicarbonate reabsorption is independent of carbonic anhydrase activity D. the pH in the lumen of the proximal tubule can reach as low as about 5.0