Reason for hyperosmolarity is: (A) Increased glomerular capillary pressure, (B) Decreased absorbtion of Na+ in PCT, (C) Increased activity of Na+ K+ 2cl- ATPase in loop, (D) Decreased activity of Na+ K+ ATPase in loop
Answer is C. Hyperosmolarity in the interstitium of kidney is due to activity of na+k+2cl- pump at the ascending limb of loop of henle Ref:Guyton and Hall textbook of medical physiology 12th edition,page:480,481,482