Per AAMC Biology Independent Question Bank #21, ADH acts on the collecting duct AND distal convoluted tubule.
"Answer Key: D Passage of fluid from the blood through the walls of the glomerulus is a passive process and depends mostly on the hydrostatic pressure of the blood in the glomerular capillaries, so answer A is incorrect. The walls of Bowman's capsule do not take part in urine processing, so answer B is incorrect. ADH does not exert its effects on the loop of Henle so C is incorrect. ADH acts on the distal tubule and collecting duct to increase water permeability by the insertion of aquaporins in the plasma membrane. This increases water reabsorption, which reduces urine output, so D is correct."
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