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. And the protein factor eleven, when it's activated it goes on to activate that same protein factor nine that we dealt with in the extrinsic pathway. Now once nine is activated, once again it goes on and activates ten. So we see the underlying reason why we have these two different processes is so that we have more pathways by which we can form more of number ten.