function of blood plasma:blood plasma is the matrix or fluid portion of the contains thrombocytes,erythrocytes and leucocytes along with different proteins,fat molecules and provides fluidity to the blood and the dissolved fibrinogen helps in blood coagulation.

steps of blood coagulation:1) Damaged blood vessels constrict
  Platelets adhere to damaged endothelium to form a platelet plug (primary hemostasis) and then degranulate
 Fibrin mesh is then produced all around the platelet plug, which helps hold the plug in place
Clots form upon the conversion of fibrinogento fibrin, and its addition to the platelet plug (secondary hemostasis). Coagulation: The third and final step in this rapid response reinforces the platelet plug.The release of prothrombin also plays an essential part in the coagulation process because it allows for the formation of a thrombus, or clot, to form. This final step forces blood cells and platelets to stay trapped in the wounded area. Though this is often a good step for wound healing, it has the ability to cause severe health problems if the thrombus becomes detached from the vessel wall and travels through the circulatory system.