#february2020mccqe1
In a study of renal function, the urine flow rate of an experimental animal is 2.0 mL/min, the glomerular filtration rate is 100 mL/min, and renal plasma flow is 500 mL/min. During this time, substance X is infused, and a steady state is achieved. The afferent arteriolar concentration of X is 100 mg/dL, the efferent arteriolar concentration is 120 mg/dL, and the renal vein concentration is 102 mg/dL. From these data, you can conclude that X is
(A) freely filtered and reabsorbed
(B) freely filtered and secreted
(C) freely filtered, but neither reabsorbed nor secreted
(D) not filtered, but secreted
(E) not filtered or secreted
In a study of renal function, the urine flow rate of an experimental animal is 2.0 mL/min, the glomerular filtration rate is 100 mL/min, and renal plasma flow is 500 mL/min. During this time, substance X is infused, and a steady state is achieved. The afferent arteriolar concentration of X is 100 mg/dL, the efferent arteriolar concentration is 120 mg/dL, and the renal vein concentration is 102 mg/dL. From these data, you can conclude that X is
(A) freely filtered and reabsorbed
(B) freely filtered and secreted
(C) freely filtered, but neither reabsorbed nor secreted
(D) not filtered, but secreted
(E) not filtered or secreted
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