Scientists Studying the Specifics of Human Kidney Function Develop a New

Scientists studying the specifics of human kidney function develop a new technique for measuring the concentration of various compounds along the length of the proximal tubule. They measure the concentrations of several endogenous substances in the fluid traversing the proximal tubule during an experiment. The following image depicts the tubular fluid/plasma ultrafiltrate concentration ratios for the measured substances: Which of the following substances are most likely to produce lines 2 and 4, respectively?

A) Bicarbonate, sodium
B) Creatinine, amino acids
C) Creatinine, glucose
D) Potassium, chloride
E) Urea, bicarbonate

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