The understanding of the blood group
➖The understanding of the blood group Blood groups refer to different classifications of blood based on the presence or absence of certain proteins on the surface of red blood cells. The two most commonly known blood group systems are the ABO system and the Rh system. The ABO blood group system is based on the presence or absence of antigens A and B on the surface of red blood cells. Blood type A has antigen A, blood type B has antigen B, blood type AB has both antigens A and B, and blood type O has neither antigen. The presence or absence of these antigens determines whether the blood type is compatible for transfusion. The Rh system is based on the presence or absence of the Rh protein on the surface of red blood cells. If the protein is present, the person is Rh positive, and if it is absent, the person is Rh negative. Rh-negative individuals who are exposed to Rh-positive blood may develop an immune response that can cause problems in future pregnancies or blood transfusions. Knowi