Urea is
A. completely reabsorbed by the nephron.
B. diffuse out of the collecting ducts into the interstitial fluid of the medulla and then diffuse into the descending loop of Henle.
C. secreted into the filtrate by cells of the distal convoluted tubule.
D. actively transported into the filtrate by cells of the collecting duct.
E. None of the choices are correct.
Answer: B
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