What is the role of fibrinogen in the blood?

Fibrinogen plays a crucial role in the process of blood coagulation, which is essential for stopping bleeding following an injury. It is a soluble protein that is converted into fibrin through the action of thrombin during the clotting cascade. This transformation allows fibrin to form a mesh-like structure that traps blood cells and platelets, creating a stable clot that seals the wound or injury site. This process is vital for maintaining hemostasis, preventing excessive blood loss, and providing a temporary barrier against pathogens at the site of injury.

The other roles mentioned in the options do not pertain to fibrinogen. While stabilizing red blood cells or transporting oxygen is essential to the function of hemoglobin and the red blood cell itself, fibrinogen does not perform these roles. Additionally, promoting infection is not a function of any normal blood component, as the body utilizes various immune cells to address infections, rather than components like fibrinogen.