Answer:
von Willebrand factor (vWF).
Step-by-step explanation:
After blood vessel injury, the binding of platelets to collagen is maintained by von Willebrand factor (vWF). Here's some information about vWF and its role:
Von Willebrand factor (vWF) is a plasma protein that is secreted by endothelial cells and platelets. It plays a crucial role in hemostasis, which is the process of stopping bleeding after a blood vessel injury.
When a blood vessel is damaged, collagen fibers are exposed. vWF binds to these collagen fibers and forms a bridge between the damaged vessel wall and platelets. This binding is important for the initial adhesion and activation of platelets at the site of injury.
vWF also serves as a carrier protein for factor VIII, a clotting factor that is necessary for the formation of blood clots. By binding to factor VIII, vWF helps protect it from degradation and extends its lifespan in the bloodstream.
In summary, von Willebrand factor (vWF) is a plasma protein secreted by endothelial cells and platelets. It plays a crucial role in maintaining the binding of platelets to collagen after blood vessel injury, aiding in hemostasis and the formation of blood clots.