<prompt> Which of the following helps to create high medullary osmotic gradient?Thick ascending loop of henleVasa rectaCounter current exchanger systemAll of the above  <response>: It creats high medullary osmotic gradient.It is by thick ascending loop of henle, collecting ductMedullary collecting duct.It maintains medullary osmotic gradient created by counter current multiplier.It is by Vasa recta 