<prompt> Reason for hyperosmolarity isIncreased glomerular capillary pressureDecreased absorbtion of Na in PCTIncreased activity of Na K 2cl- ATPase in loopDecreased activity of Na K ATPase in loop  <response>: Hyperosmolarity in the interstitium of kidney is due to activity of nak2cl- pump at the ascending limb of loop of henle Ref:Guyton and Hall textbook of medical physiology 12th edition,page:480,481,482 