2024 Excretory Products and their EliminationPermeability of Loop of Henle and PCT Histology Medium Question 5 of 60 in Excretory Products and their Elimination

Given below are two statements: Statements I: In the nephron the descending limb of loop of Henle is impermeable to water and permeable to electrolytes. Statement II: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption. In the light of the above statements, choose the correct answer from the options given below:

A Statement I is true but Statement II is false.
B Statement I is false but Statement II is true.
C Both Statement I and Statement II are true.
D Both Statement I and Statement II are false.

The answer is D.

Solution

Statement I is false: the descending limb of the loop of Henle is permeable to water but almost impermeable to electrolytes. Statement II is false: the PCT is lined by simple cuboidal brush border epithelium (not columnar), which increases the surface area for reabsorption. So both statements are false.

Concept Water/electrolyte permeability of loop of Henle limbs and PCT epithelium

Excretory Products and their Elimination in past papers

60 questions from this chapter have appeared across 24 exam years.