And they are also used to regulate the composition of the nutrients, molecules and ions of the matrix of different cells found inside our body. Now, what about the cells? So, earlier we said that our blood is a connective tissue. 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.