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

Question

Quizplus · Accepted Answer

Urea is produced in the liver and diffuses out of the collecting ducts into the interstitial fluid of the medulla. From there it can diffuse into the descending loop of Henle. Urea is partly reabsorbed in the nephron, but not completely. It is not actively transported into the filtrate by cells of the collecting duct.

Urea Is