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The human body contains multiple blood group systems, which are genetically determined classifications of blood based on the presence or absence of specific antigens on the surface of red blood cells (RBCs). These systems are important in transfusion medicine, organ transplantation, forensic science, and in understanding susceptibility to certain diseases. The most well-known and clinically significant blood group systems are the ABO and Rh systems, but over 30 recognized systems exist, each with their own unique antigens and inheritance patterns. This answer provides an in-depth overview of the major and minor blood group systems with relevance to applied physiology. 1. ABO Blood Group System The ABO blood group system is the most important and was discovered by Karl Landsteiner in 1901. It is determined by the presence or absence of two antigens, A and B, on the surface of RBCs. * Type A: Has A antigens on RBCs and anti-B antibodies in plasma. * Type B: Has B antigens and anti-A antibodies. * Type AB: Has both A and B antigens but no antibodies, making it the universal recipient. * Type O: Has no A or B antigens but has both anti-A and anti-B antibodies, making it the universal donor. This system plays a critical role in blood transfusion compatibility. Mismatched transfusion can cause severe hemolytic reactions due to antigen-antibody interaction. 2. Rh (Rhesus) Blood Group System The Rh system is the second most important, especially in obstetrics and transfusion. It includes over 50 antigens, but the most significant is the D antigen. * Rh-positive: Presence of D antigen. * Rh-negative: Absence of D antigen. This system is vital in ______ ______ _________ _______ ______ _______ _______.
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