ANATOMY

Detailed explanation-1: -Vasopressin increases the water permeability of the renal collecting duct cells, allowing more water to be reabsorbed from collecting duct urine to blood.

Detailed explanation-2: -ADH primarily affects the ability of the kidney to reabsorb water; when present, ADH induces expression of water transport proteins in the late distal tubule and collecting duct to increase water reabsorption.

Detailed explanation-3: -ADH Feedback ADH causes the walls of the distal convoluted tubule and collecting duct to become permeable to water-this drastically increases the amount of water that is reabsorbed during tubular reabsorption.

Detailed explanation-4: -For ADH, secretion is regulated by plasma osmolality. If plasma osmolality increases, it stimulates secretion of ADH, which acts at the collecting duct of the nephron where it causes reabsorption of only water and producing concentrated urine.