The ABO blood group system classifies human blood into four main types based on the presence or absence of specific antigens on the surface of red blood cells. These blood types are A, B, AB, and O, which determine compatibility for blood transfusions.
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Antigen: A substance that triggers an immune response when detected by the body, often found on the surface of pathogens, cells, or in this case, red blood cells.
Antibody: A protein produced by the immune system that recognizes and binds to specific antigens to neutralize or destroy them.
Blood transfusion: The process of transferring blood or blood products from one person (donor) into another person’s bloodstream (recipient), commonly used to replace lost components of the blood