Final answer:
In the coagulation process, the plasma protein fibrinogen is converted to fibrin to form a blood clot that prevents excess blood loss.
Step-by-step explanation:
As part of coagulation, the plasma protein called fibrinogen is converted to fibrin. This critical conversion is a central part of the blood clotting process, where fibrin forms a mesh that traps platelets and erythrocytes, leading to the formation of a blood clot. Fibrinogen, a soluble protein present in blood plasma, undergoes this transformation into an insoluble protein, fibrin, typically at a wound site to prevent excessive bleeding. Coagulation factors, including vitamin K-dependent enzymes, and platelets play a significant role in this process. The clot ultimately prevents further blood loss and begins the wound healing process.