So we know that the entire purpose of the intrinsic and the extrinsic pathway is to produce this complex the dimer protein complex we call prothrombinase. And that's because it's prothrombinase that ultimately activates prothrombin into thrombin. And it's thrombin that essentially activates fibrinogen to form fiber and that's the protein fiber that aggregates to form those blood clots. So the entire point of the intrinsic and extrinsic pathway is to form these two components to basically form this dimer that consists of the two subbutants factor ten and factor five, we call prothrombinase. So notice that when we actually form thrombin thrombin not only activates fibrinogen into fibrin and calls upon platelets and aggregates factor 13 that is needed to form the covalent bonds between the fibrin molecules. But Thrombin actually goes back to the beginning of this entire pathway and activates three different types of factors.