1. Tardigrade
  2. Question
  3. Biology
  4. Compare the statements A and B. Statement A: When the urine moves through the descending limb, it becomes hypertonic and as it passes through the ascending limb of Henles loop. It becomes hypotonic. Statement B. The descending limb is permeable to sodium ions, while the ascending limb is impermeable to sodium ions.

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Q. Compare the statements A and B.
Statement A: When the urine moves through the descending limb, it becomes hypertonic and as it passes through the ascending limb of Henles loop. It becomes hypotonic.
Statement B. The descending limb is permeable to sodium ions, while the ascending limb is impermeable to sodium ions.

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Solution:

The descending limb of loop of Henie is permeable to water but almost 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.