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Question
Statement 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:
Options
Statement I is true but Statement II is false.
Statement I is false but Statement II is true.
Both Statement I and Statement II are true.
Both Statement I and Statement II are false.
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Solution
Both Statement I and Statement II are false.
Explanation:
The loop of Henle’s descending limb is comparatively resistant to electrolytes but porous to water. Osmosis allows water to exit the descending limb while electrolytes are reabsorbed in the ascending limb. Instead of columnar epithelium, simple cuboidal epithelium with microvilli lines the proximal convoluted tubule. The surface area available for the reabsorption of water, ions, and other materials is increased by microvilli.
