And so water increases inside our blood plasma, and this increases our blood pressure inside our blood vessel. Now, angiotensin two actually also constricts our blood vessels, and that causes an increase inside our blood vessels. So more specifically, it causes the constriction of our arterioles throughout the body as well as inside our kidneys. Now, when our blood pressure increases, when our blood volume increases, the increase in the blood volume can basically create a negative feedback loop and that will basically go on and cause our Rena to stop being secreted by the kidney. So let's take a look at the following diagram that basically describe summarizes the renal angiotestin aldosterone system. So let's suppose inside our blood, we have a low volume of blood plasma, we have low blood pressure, and that means we have a low profusion rate inside our kidneys.