Read the given statements and identify the structure referred here.
(i). Reabsorption in this region in minimum.
(ii). This region plays a significant role in the maintenance of high osmalarity of interstitial fluid.
(iii). Its descending limb is permeable to water but almost impermeable to electrolytes.
(iv). Its ascending limb is impermeable to water but allows transport of electrolytes actively ro passively.

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