Counter current mechanism, all are true except
Occurs due to opp flow in vasa recta and loop of henle
Seen in medullary nephron
Helps in creating osmolarity gradient
Urea has no role
Countercurrent mechanism, a system in the renal medulla that facilitates concentration of the urine as it passes through the renal tubules, were medullary osmolarity created by urea.Ref: Ganong&;s review of medical physiology; 24th edition; page no; 687
Renal physiology