Now the final thing that I'd like to mention is the pathway that the blood actually follows within our cardiovascular system. So here we're going to show that the cardiovascular system of the human body is in fact a closed circuit. So let's take a look at the following diagram which basically describes the simplified diagram for the cardiovascular system. Now if my body essentially points this way then this is the right side of my body, this is the left side of my body. And this is exactly what this diagram shows. So we have the right lung, the left lung.