What is the significance of the proximity of Henle’s loop and vasa recta?

What is the significance of the proximity of Henle’s loop and vasa recta? Correct Answer Maintains osmolarity

The proximity between the Henle’s loop and vasa recta, as well as the counter-current in them, help in maintaining an increasing osmolarity towards the inner medullary interstitium.

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Vasa Recta is absent in: