A biopsy is a medical test commonly performed by a surgeon, interventional radiologist, or an interventional cardiologist involving extraction of sample cells or tissues for examination to determine the presence or extent of a disease. The tissue is generally examined under a microscope by a pathologist, and can also be analyzed chemically.
in fibrin. ...from fibrinogen, a soluble protein that is produced by the liver and found in blood plasma. When tissue damage results in bleeding, fibrinogen is converted at the wound into fibrin by the action of thrombin, a clotting enzyme.
In plasma thromboplastinogen transforms in thromboplastin, a reaction triggered by tissue and platelet factors released after injury of blood vessel. Thromboplastin then catalyzes along with calcium ions the transformation of the prothrombin in thrombin. Thrombin then catalyzes a reaction which produces fibrin from fibrinogen. Fibrin, as an insoluble substance, precipitates to form a network which traps red blood cells and platelets forming the blood clot and containing hemorrhage.