ADH reduces output of urine by binding to protein receptors called receptors in the membranes of the collecting tubule cells in the . The binding of ADH to its receptor activates cyclase which converts ATP to the second messenger, . Protein Kinase A is activated by cAMP and triggers the movement of containing vesicles to the cell membrane. The aquaporins form channels in the cell membrane that allows the return of from the kidney filtrate back into the . Word Bank:
G V2 luminal kidney blood cAMP water aquaporin adenylyl basolateral