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Which of the following statements is correct?

1. The descending limb of loop of Henle is impermeable to water.
2. The ascending limb of loop of Henle is permeable to water.
3. The descending limb of loop of Henle is permeable to electrolytes.
4. The ascending limb of loop of Henle is impermeable to water.

Correct answer: The ascending limb of loop of Henle is impermeable to water.

Solution

The ascending limb of the loop of Henle does not allow water to pass through, so it is impermeable to water. This property helps dilute the tubular fluid while creating the medullary osmotic gradient.

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