Biology - Excretory Products and their Elimination Question with Solution | TestHub
The urea cannot pass out from the tubular fluid while flowing through the renal tubule in the following parts EXCEPT:
Options:
Answer:
Solution:
The renal tubule segments such as the distal convoluted tubule (DCT), the cortical portion of the collecting duct, and the thick ascending limb of the loop of Henle are impermeable to urea.
The thin ascending limb of the loop of Henle is permeable to urea, but urea diffuses into the tubular fluid from the medullary interstitium in this region.
The deep medullary region of the collecting duct is permeable to urea. In this segment, urea diffuses out of the tubular fluid into the medullary interstitium to help maintain the high osmolarity of the inner medulla.
Thus, urea can pass out from the tubular fluid only in the deep medullary region of the collecting duct.
Answer: Deep medullary region of collecting duct.
