The glomerular filtrate in the loop of Henle gets concentrated

Reabsorption is minimum in its ascending limb which plays a significant role in the maintenance of high osmolarity of medullary interstitial fluid. The descending limb of

the loop of Henle is permeable to water but almost impermeable to electrolytes so water can flow out. This concentrates the filtrate as it moves down. The ascending

limb allows transport of electrolytes and impermeable to water. So as the concentrated filtrate passes through the ascending limb, it gets diluted due to the passage of

electrolytes to the medullary fluid.