The extracellular matrix of blood is called plasma. Plasma is the fluid part of the blood in which the red blood cells, white blood cells and platelets are suspended.
Plasma makes up approximately 55 percent of the volume of blood in the body. Plasma itself contains about 92 percent water, 7 percent protein and 1 percent vitamins, minerals, sugars, fats and hormones.
Blood is considered to be a specialized type of connective tissue. The function of connective tissue is to bind other tissues in the body together. In order to accomplish this, most connective tissue contains cells that are distributed throughout an extracellular matrix.