Indicate whether the following statement is true or false:
Henle's loop plays an important role in concentrating the urine.

$A$: The final reabsorption of water from urine into blood occurs through the collecting duct of a mammalian nephron,resulting in the production of hyperosmotic urine.
$R$: The loop of Henle is responsible for the formation of a sodium gradient across the depth of the medullary interstitium of a mammalian kidney.

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

The proximity between Henle's loop and vasa-recta as well as the counter-current in them help in maintaining an ...$A$... in molarity towards the inner medullary interstitium,i.e.,from ...$B$... $mOsmol \ L^{-1}$ in the cortex to about ...$C$... $mOsmol \ L^{-1}$ in the inner medulla. Here $A$,$B$,and $C$ refer to:

Vasa recta refers to . . . . . . .

The osmotic concentration in the interstitial fluid is primarily due to the presence of $.....$.