Factors of hemostasis 1.Blood vessel 2.Platelet --When it is injured its endothellal cells will release · By VWF,platelets adhere to VWF to make platelets adhere collagen fiber to form thrombus and aggregate there of platelets release TF to start extrinsic pathway of coagulation By fibrinogen,platelets aggregate collagen fiber of blood vessel exposed will activate FXIl,and Then the platelets activated start intrinsic pathway of excrete substance to regulate coagulation blood coagulation 血小板 GPI。-IX 纤维 WF 胶原 GPII。-a 蛋白原 血小板聚集