Blood clotting or blood coagulation occurs when blood vessel is damaged or broken. There are there mechanisms in blood clotting process: vascular spasm, platelet plug formation and blood clotting (coagulation).
Vascular spasm occurs immediately after a blood vessels get injury. The muscle of the blood vessel contracts and hold off the blood supply to the area and it can hold for minutes to hours; this process prevents the loosing blood from the body.
Platelet plug formation
Platelets plug is formed after a blood vessel has been contracted. There are three key stages in the platelet plug formation: platelet adhesion, platelet release reaction and platelet aggregation. Platelet adhesion: it occurs as platelets detect the damage of blood vessel and start to stick together to create the surface. Platelet release reaction: when platelet is stick to a damage area, they start connect each other; in this process there are two types of chemical involve: alpha granules and dense granules.
Haemostasis is a process that functions to prevent the loss of blood zzz the vascular system and make sure the patency of the blood vessels (Psychology, pp.359). There can be divided into four steps in haemostasis process: vasoconstriction (the myogenic reflex), the formation of a platelet plug, the formation of a fibrin clot (blood clotting or coagulation) and fibrinolysis. Vasoconstriction occurs immediately after a blood vessels get injury. The muscle of the blood vessel contracts and hold off the blood supply to the area and it can hold for minutes to hours.
Lymphocytes (Lymph cells)
In our body, antibodies are produce when lymph cells detect the virus or microorganism. Lymphocytes have large nuclei and they move around in the blood stream. When virus enters into the blood, lymphocytes produce chemicals and kill the virus.