AP EAMCET Medical 2016 Paper

Assertion (A): The renal fluid becomes increasingly concentrated when it flows down in the descending limb of loop of Henle towards inner medulla, but its concentration decreases in the ascending limb when it flows towards the cortex
Reason (R): The descendinglimb of the loop of Henle water is reabsorbed; the ascending limb is impermeable to water but salts are absorbed.