ANATOMY

Detailed explanation-1: -The descending portion of the loop of Henle is extremely permeable to water and is less permeable to ions, therefore water is easily reabsorbed here and solutes are not readily reabsorbed.

Detailed explanation-2: -This part of the nephron is called the loop of Henle. Its main function is to reabsorb water and sodium chloride from the filtrate. This conserves water for the organism, producing highly concentrated urine.

Detailed explanation-3: -Reason: The descending limb of the loop of Henle reabsorbs water, the ascending limb is impermeable to water but salts are reabsorbed.

Detailed explanation-4: -Water reabsorption occurs in the thin descending limb of the Loop of Henle. It is permeable to water, which means that H2O molecules are freely able to leave it. Similarly to in the PCT, water can leave the thin descending limb into the more concentrated medulla through transcellular and paracellular movement.

Detailed explanation-5: -As filtrate moves down the loop of Henle, water is reabsorbed, but ions (Na, Cl) aren’t. The removal of water concentrates the Na and Cl in the lumen.