Physiologists Are Investigating How the Plasma Concentration of Various Substances

question 294

Multiple Choice

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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