In this activity, what happens to urine volume as the concentration gradient increases? a) INCREASE b) DECREASE c) NO CHANGE d) NOT ENOUGH INFORMATION TO DETERMINE With ADH added, was the urine concentration the same, larger, or smaller than the concentration gradient? a) SAME b) LARGER c) SMALLER d) NOT ENOUGH INFORMATION TO DETERMINE ADH allows water reabsorption in the nephron. What is the driving force for water movement from the filtrate to the interstitium? a) BULK FLOW b) OSMOTIC PRESSURE c) ACTIVE TRANSPORT d) FACILITATED DIFFUSION