It consists of the matrix known as the blood plasma, and it also contains individual cells. So the question is, what types of cells are found inside our blood? Well, notice that if the blood plasma makes up 55% of the volume of blood, that implies that the remaining 45% makes up our cell. So the cells make up 45% of the blood volume of our blood. Now, what types of cells are found inside our blood? Well, we have red blood cells, also known as erythrocytes.