And this is what we're going to focus on in this lecture. So if we examine Cartilage we have many different types of cells and surrounding the cells we have the extracellular matrix. Now the major component of Carthage is collagen. So the major component of the exacerlic matrix is of course, collagen. And collagen as we know, gives the exacer matrix its structure and it gives it tensile strength. Now the other major component of the extracellular matrix in Cartilage is aggregate.