"Diluting segment" of a nephron is:: (A) Descending limb of loop of Henle, (B) Thick ascending limb of loop of Henle, (C) DCT, (D) Collecting duct
Answer is B. Thick ascending LOH is k/a the diluting segments of the nephron. It is impermeable to water. It has NKCC cotranspoer proteins that reabsorb Na+, K+, 2Cl- ions. Thus,There is a net reabsorption of solutes with no movement of water, making the tubular fluid that reaches the DCT hypotonic.