Vasopressin acts by:
A i.e. Water transpo across collecting ductVasopressin acts by increasing permeability of collecting ductsQ. to water. The key to the action of vasopressin on collecting duct is aquaporin -2 . The overall effect is retention of water in excess of solute which results in decrease effective osmotic pressure
Water transpo across collecting duct
Water absorption at medullary ducts
Water secretion at loop of Henle
Water transpo at PCT