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. The intrinsic pathway is shown with the blue arrows and when these two pathways converge they form the final common pathway and that is shown in red. Now, the positive feedback loops are shown in green. So let's begin with those.