Now, as it turns out, the function of our collecting duct is actually controlled by two important types of hormones that we already spoke about. One of these hormones is ADH, the antidiatic hormone also known as vasopressin. And the other hormone that controls the functionality of the collecting duct is aldosterone. So, under dehydrating conditions, that is, when the volume of water inside the blood plasma of our body is low, what happens is our body releases these hormones. It releases ADH and aldosterone, and these hormones act on our collecting dog to basically make it permeable to water. Now, the mechanism by which these two hormones actually act are different.