And so after this process, we basically see two different layers form. The bottom layer found at the bottom of the test tube consists of our cells, and the upper portion of the test tube consists of the blood plasma. So let's begin by discussing what the blood plasma is, what is found inside the blood plasma, and what the function of our blood plasma is. Now, blood plasma is actually the extracellular matrix that we spoke of earlier, and it makes up about 55% of the volume of our blood. Now, the blood plasma is a fluidlike substance that consists of many different things. So let's discuss some of the things that we normally find inside our blood.