What is coagulation ?

Explanation

When the blood vessel is injured, the platelets collect at the site of the injury and form a plug and prevents further loss of blood. This is known as coagulation of blood.
Process of Coagulation :
1) When the blood flows out from injuries, the platelets release an enzyme called thrombokinase.
2) Thrombokinase acts on another substance present in the blood called prothrombin converting it into thrombin.
3) Thrombin acts on another substance called fibrin, that is present in dissolved state converting it into insoluble fibrin.
4) The blood cells entangle in the fibrin fibers forming the clot.
5) The fibrin fibers are attached to the edges of the wound and pull them together.