Loop of Henley and Countercurrent Exchanger?

very simple very easy...try to understand...salts which are reabsorbed from ascending limb of loop of henle enter into medullary interstitium and most enter into descending limb of vasa recta.water which is reabsorbed from descending limb of loop of henle enter into medullary interstitium and most enter into ascending limb of vasa recta. salts excess in ascending limb of vasa recta ener into medullary interstitium and goes to different part of nephron.....this is how the loop of henley functions as a countercurrent exchanger with the blood stream for both water and solutes...usually it is written very typical in books n all....i hope it helped....