Answer:
Fibrin
Explanation:
The name of the element that is critical for initiating the formation of a blood clot is fibrin.
Fibrin is a fibrous, non-globular protein that is formed by the polymerization of fibrinogen as a result of the reaction with protease thrombin. The threads from fibrin form a network of fibers around the platelet plug at the area of damaged blood vessels in the process of injuries, thereby forming the initial clot.