So we have the intrinsic pathway and we have the extrinsic pathway and it's also achieved by using positive feedback loops. Now, what is a positive feedback loop? Well, in a certain pathway in a certain reaction pathway we have many intermediates. And what a positive feedback is it's when one of those intermediates down that reaction pathway returns back to some initial molecule and activates it and promotes its activation so that ultimately we produce even more of the final product in this case, even more of our blood clot. So recall that DCE is our blood clotting cascade. So our extrinsic pathway is shown with the black arrows.