Antidiuretic hormone (ADH) functions at the cellular level by . Antidiuretic hormone (ADH) functions at the cellular level by . activating aquaporin molecules of collecting duct cells causing membranes to include more phospholipids that have unsaturated fatty acids triggering the synthesis of an enzyme that makes the phospholipid bilayer more permeable to water stimulating the reabsorption of glucose through channel proteins decreasing the speed at which filtrate flows through the nephron, leading to increased