If the kidneys fail to reabsorb water,what will be the effect on the tissues?

Mammals have the ability to produce

Which of the following statements about the reabsorption process in Henle's loop are correct?
$(a)$ The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes.
$(b)$ Urine gets concentrated in Henle's loop.
$(c)$ Reabsorption of $Na^+$ and water takes place in Henle's loop.
$(d)$ Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop.
Choose the correct answer from the options given below:

The function of Henle's loop is

$\text{NaCl}$ from the ascending limb of Henle's loop is exchanged with:

Mention the substances that exit from the tubules in order to maintain a concentration gradient in the medullary interstitium.