Blood is a dispersed system made up of blood cells suspended in blood serum. Blood serum constitutes the fluid part of the system. It is composed of 91% water, 8% proteins, including antibodies, and 1% salts. The blood cells that make up the solid part of the system, made up of three types of cells; red blood cells, containing antigens on the outer surface, white blood cells which are important for the immune system, and blood plates which function in clotting. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay Antibodies are produced as part of the immune system, and their function is to inactivate foreign substances by binding to its antigens. This is an important mechanism for eliminating potentially harmful substances. There are different types of antibodies and antigens. The type of antigens present in the blood determine your blood group according to the AB0 system. In a successful blood type match, the antigens do not bind to the antibodies. If the wrong antibodies are mixed with the antigens, they will bind to each other in a reaction called agglutination. Antibodies attack red blood cells because its antigens are seen as foreign. This is seen by the aggregation of the blood and is very dangerous for humans. It is therefore very important that the same blood group as the patient is used in blood transplants. Specialized white blood cells, B lymphocytes, produce antibodies. Antibodies are, together with B cells, one of the most important functions of immunity. Antigen is important for stimulating the immune response, which is activated by lymphocytes and produces lymphocytes. This lymphocyte-stimulating immune response causes the lymphocytes to produce antibodies or directly attack the antigen. Red blood cells react differently with different types of antigens. A type A red blood cell has A antigens around the surface of the cell. They need an Anti-B antibody to react with them. Type B blood cells have B antigen and the type B antibody is A. Type AB blood cells have both A and B antigens and therefore have no antibodies to bind to. The type 0 blood cell has no antigens and has, therefore, both A and B antibodies. If we take type A, as an example, and add it to antibody A, agglutination will occur. This is because the antigens around the cell do not bind to antibody A. The same will happen if other blood cells are added to the wrong antibody.