What are the two main functions of the loop of Henle?

Question

Quizplus · Accepted Answer

The loop of Henle creates a concentration gradient of salt in the medulla of the kidney, which is essential for the production of concentrated urine. The descending limb of the loop of Henle is permeable to water but not to salt, allowing for reabsorption of water back into the renal medulla. As the filtrate ascends the ascending limb of the loop of Henle, it becomes impermeable to water but actively reabsorbs salt, further increasing the concentration gradient. This high salt concentration in the medulla allows for the final reabsorption of water in the collecting ducts and the production of concentrated urine.

What Are the Two Main Functions of the Loop of Henle