A Healthy 32-Year-Old Man Enrolls in a Clinical Study Investigating

A healthy 32-year-old man enrolls in a clinical study investigating potassium handling by the kidney.  During the study period, he is given oral potassium supplements and potassium levels in the serum and urine are closely monitored.  Compared to the amount of potassium delivered to the glomerular capillaries, the percentage of potassium remaining in this individual's tubular fluid is most likely to vary by which of the following amounts?

A) A
B) B
C) C
D) D

Correct Answer:

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