Which of the following helps to create high medullary osmotic gradient?
It creats high medullary osmotic gradient.
It is by thick ascending loop of henle, collecting duct

Medullary collecting duct.

It maintains medullary osmotic gradient created by counter current multiplier.
It is by Vasa recta
Thick ascending loop of henle
Vasa recta
Counter current exchanger system
All of the above