Physiologists Are Studying How the Plasma Concentration of Various Substances

question 38

Multiple Choice

Physiologists are studying how the plasma concentration of various substances affects the degree to which they are excreted in the urine.  During one experiment, a substance freely filtered at the glomerulus is infused intravenously at various rates.  The plasma concentration (mg/mL) and urinary excretion rate (mg/min) of the substance are monitored.  Assuming a constant glomerular filtration rate (GFR) of 100 mL/min, the following observations are made: 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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Definitions:

Dementia

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A condition characterized by alterations in thinking, mood, or behavior associated with distress or impaired functioning.

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