Physiologists Are Investigating How the Plasma Concentration of Various Substances

Physiologists are investigating how the plasma concentration of various substances affects their excretion in the urine. In one experiment, a freely filtered substance at the glomerulus is infused intravenously at various rates. The substance's plasma concentration (mg/mL) and urinary excretion rate (mg/min) are measured. The following observations are made assuming a constant glomerular filtration rate (GFR) of 100 mL/min: Which of the following substances is most likely to demonstrate a similar pattern of filtration and excretion in a healthy adult?

A) Albumin
B) Creatinine
C) Glucose
D) Mannitol
E) Urea

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