There are four steps involved in the clotting of blood :
The damaged tisue cells and platelets near the wound or cut, release Thrombokinase/ Thromboplastin/ Factor X/ Stuart Factor.
This Thrombokinase(or any of the above names) acts as an ezyme, and with the help of Ca+ ions, convert a substance in the blood plasma called Prothrombin/ Thrombinogen which is inactive, to Thrombin, which is acive.
This Thrombin, along with Ca+ ions, reacts with a soluable substance in the blood plasma called Fibrinogen, to convert it form its soluable form to insoluable Fibrin. This fibrin then forms microscopic thread like structures, which form a network near the opening of the wound.
Blood cells are now trapped in this sticky network made from Fibrin, then this network shrinks and squeezes out all the rest of the blood plasma. This squeezed out clear liquid is known as Serum. The solid mass left behind is known as the Clot/ Thrombus
navaneth 113 days ago