Blood clotting 

Blood Clotting (Coagulation)
Hemostasis is the prevention of blood loss after an injury
Mechanism of bood coagulation includes:
1. Vascular constriction
2. Platelet plug formation
3. Blood clot formation.
Steps of Blood clot formation includes:
1. Formation of Prothrombin ctivator
2. Conversion of Prothrombin in to Thrombin
3. Conversion of Fibrinogen in to Fibrin