The ABO blood group system classifies blood types according to the different types of antigens in the red blood cells and antibodies in the plasma. This can cause a severe and possibly life-threatening reaction. This is why it is essential to match blood types when a person needs a transfusion.Īccording to the American Red Cross, If a person receives red blood cells with antigens that are not already present in their system, their body will reject and attack the new red blood cells. These antibodies will target an antigen if they consider it a foreign object. Scientists use two types of antigens to classify blood types:Īntigens and antibodies play a role in the immune system’s defense mechanism.
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