Which part of nephron found in medullary region and helps in reabsorption of electrolytes?

The ascending limb of the loop of Henle is indeed located in the medullary region of the kidney and is responsible for the reabsorption of electrolytes, specifically sodium (Na⁺) and chloride (Cl^-) ions, from the filtrate.

The loop of Henle consists of two limbs: the descending limb and the ascending limb. The descending limb is permeable to water but not ions, allowing water to passively exit the tubule and be reabsorbed into the surrounding interstitial fluid. In contrast, the ascending limb, particularly the thick ascending limb, is responsible for actively reabsorbing sodium and chloride ions. This active transport creates a concentration gradient in the medullary interstitium, which is crucial for the kidney's ability to concentrate urine.