The longest loop of Henle is found in

What is the osmolarity of the filtrate at the hairpin bend of the loop of Henle?

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:

Explain the mechanism of concentration of the filtrate.

The concentration of urine depends upon which part of the nephron?

What is the range of osmolarity from the renal cortex to the inner medulla?