Revision Concept: Functions of Renal Tubules -
Henle’s Loop:
- Reabsorption is minimum in its ascending limb. However, this region plays a significant role in the maintenance of high osmolarity of medullary interstitial fluid.
- The descending limb of the loop of Henle is permeable to water but impermeable to electrolytes.
- This concentrates the filtrate as it moves down.
- The ascending limb is impermeable to water but allows transport of electrolytes actively or passively.
- Therefore, as the concentrated filtrate passes upward, it gets diluted due to the passage of electrolytes to the medullary fluid.
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Reabsorption is minimum in its ascending limb. However, this region plays a significant role in the maintenance of high osmolarity of medullary interstitial fluid. Hence the correct option is ascending limb of Henle's loop
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