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Understanding Blood Types Blood types play a critical role in the field of medicine, particularly concerning transfusions and organ transplants. The ABO and Rh systems are the primary classification methods used to categorize human blood. The ABO system divides blood into four main groups: A, B, AB, and O. Each group is defined by the presence or absence of specific antigens on the surface of red blood cells. For instance, type A blood contains A antigens, while type B blood has B antigens. Type AB blood possesses both antigens, making it a universal recipient. Conversely, type O blood lacks A and B antigens, making it a universal donor. The Rh … 続きを読む