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Question

Which of the following statements is correct ?
  1. The ascending limb of loop of Henle is impermeable to water 
  2. The descending limb of loop of Henle is impermeable to water 
  3. The ascending limb of loop of Henle is permeable to water 
  4. The descending limb of loop of Henle is permeable to electrolytes 


Solution

The correct option is A The ascending limb of loop of Henle is impermeable to water 
The Henle's loop has a descending and an ascending limb.
The descending limb of loop of Henle is permeable to water but almost impermeable to electrolytes so that the filterate is concentrated as it moves down.
The ascending limb is impermeable to water but allows active or passive transport of electrolytes so that the concentrated gets diluted as it moves upwards due to the passage of electrolytes to the medullary fluid. 

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