d) ADHRecall that urine is formed after the filtrate passes through the collecting duct. The amount of water reabsorbed in the collecting duct determines how diluted or concentrated urine will be.... so predict the correct hormone will act directly on the collecting ductADH prevents fluid loss to maintain blood volume by increasing reabsorption of water from renal tubules and collecting ductsNOT B- b/c renin helps increase blood pressure by increasing secretion of aldosteroneGREAT CHART ON P236!!!!!!