The site of action of vasopressin is
Vasopressin (ADH) Increasing the water permeability of distal tubule and collecting duct cells in the kidney, thus allowing water reabsorption and excretion of more concentrated urine. Ref: Ganong's Review of Medical Physiology; 24th edition; page no: 698
Ascending limb of loop of Henle
Descending limb of loop of Henle
Distal tubule
Proximal tubule
Renal physiology