Fibrin

Overview

Fibrin is a fibrous, insoluble protein that forms the structural backbone of blood clots. It plays a central role in hemostasis (the process of stopping bleeding) and wound healing. Fibrin is produced from a soluble precursor protein called Fibrinogen, which is made by the liver and circulates in the blood plasma at relatively high concentrations (typically 1.5–4 g/L).

Cardiovascular System

 Fibrin is the compound produced within the body that is responsible for Blood Clotting:

 Fibrin is the blood-clotting protein that actually begins to seal off the blood flow in bleeding wounds by forming long, thin strands of material across wounds like a net.

 The "net" traps Red Blood Cells, forming a Blood Clot.  As the Blood Clot dries, it turns into a Scab.  The Blood Clot traps Blood inside the Blood Vessel, which then undergoes further repair by other Adhesive Repair Proteins.