form called Thrombin. And thrombin does three things. It activates our platelets, it calls upon these platelets, it activates Fibrinogen into Fibrin, and it activates facts of 13 that is needed to basically covalently bond these fibrin along that rupture to form that meshlike network of proteins. That seals off that rupture and prevents the movement of blood out of that blood vessel and ultimately prevents the person from going into shock. Now, the final part that I'd like to briefly talk about and maybe focus more on in the next lecture, are these green arrows? So what the green arrows represent are amplification mechanisms.