NEET2026BiologyChapterActual
Given below is a schematic representation of a mammalian nephron with certain parts labeled as A, B, C, and D. Select the correct statement regarding the physiological functions of these labeled parts. Assume: A = Proximal Convoluted Tubule (PCT) B = Descending limb of Loop of Henle C = Distal Convoluted Tubule (DCT) D = Collecting Duct
Options
- APart 'A' is primarily responsible for the conditional reabsorption of Na^+ and water depending on the body's h
- BPart 'B' is impermeable to water but allows the transport of electrolytes actively or passively.
- CPart 'C' is capable of selective secretion of hydrogen ions, potassium ions, and NH₃ to maintain blood pH and
- DPart 'D' allows the passage of small amounts of urea into the medullary interstitium to decrease the osmolarit
Correct answer
C. Part 'C' is capable of selective secretion of hydrogen ions, potassium ions, and NH₃ to maintain blood pH and
Step-by-step solution
Based on the given schematic representation of a mammalian nephron: A = Proximal Convoluted Tubule (PCT) B = Descending limb of Loop of Henle C = Distal Convoluted Tubule (DCT) D = Collecting Duct Evaluating the options: Option (A) is incorrect because conditional reabsorption of Na^+ and water takes place in the DCT (Part C), not the PCT. The PCT is responsible for the obligatory reabsorption of most nutrients, and 70-80% of electrolytes and water. Option (B) is incorrect because the descending limb of the Loop of