Well, the intrinsic pathway is a bit more slow acting than the extrinsic pathway and that's why we differentiate them. So now let's begin by basically describing how the intrinsic pathway is initiated. Well, once again as soon as the rupturing process takes place we expose the blood vessel to the outside tissue. And this outside tissue is composed of collagen fibers, collagen protein fibers. Now as soon as the inactive version of protein factor twelve is exposed to the collagen in that extracellular matrix it is activated into the active version of factor twelve. And protein factor twelve then goes on and activates another protein, protein factor eleven.