Which section of the renal tubule is permeable to urea? A. descending limb of the loop of Henle. B. ascending limb of the loop of Henle. C. collecting duct in the presence of aldosterone. D. proximal convoluted tubule.
Option D. Proximal convoluted tubule is permeable to urea, in order extent of fi ltrate in PCT decreases because of absorption of water, urea concentrations in fi ltrate increases. This promotes passive reabsorption of urea alongside its concentration gradient.
