Counter-current mechanism helps in the maintenance of

Step-by-step solution

The above described transport of substances facilitated by the special arrangement of Henle’s loop and vasa recta is called the counter current mechanism. This mechanism helps to maintain a concentration gradient in the medullary interstitium. Presence of such interstitial gradient helps in an easy passage of water from the collecting tubule thereby concentrating the filtrate urine. Human kidneys can produce urine nearly four times concentrated than the initial filtrate formed.