Final answer:
Fibrinogen is a plasma protein essential for blood clotting, where it polymerizes and converts to fibrin, which forms a mesh that traps cells to create a clot.
Step-by-step explanation:
The function of fibrinogen is related to the blood clotting process, known as coagulation. Fibrinogen is a soluble plasma protein produced by the liver that plays a critical role in hemostasis. During coagulation, fibrinogen is converted into fibrin. Fibrin forms a mesh that traps more platelets and erythrocytes—red blood cells—producing a clot that prevents further blood loss from damaged vessels.
Considering your multiple-choice options, the correct function of fibrinogen is option 5) Polymerization, since it polymerizes to form fibrin during the blood clotting process.