Fibrinogen

[Sarah]

An albuminous substance existing in the blood, and in otheranimal fluids, which either alone or with fibrinoplastin orparaglobulin forms fibrin, and thus causes coagulation.

[Lizzy Liz]

a substance produced in the liver that is changed into fibrin to clot the blood when body tissue is damaged

[Agnes]

A soluble protein present in blood plasma, from which fibrin is produced by the action of the enzyme thrombin.