find out about blood groups , picure and their importanes for class7
Answers
Blood Group System
Karl Landsteiner, an Austrian scientist discovered the ABO blood group system in the year 1900. In his experiments, he mixed different blood types and noted that the plasma from certain blood type produced agglutinates or formed clusters which were caused by the absence of molecules on red blood cells and resulting in antibodies to defeat that molecule. He then made a note of the agglutination and divided the blood types into 4 different groups. For the discovery of ABO blood group, he was awarded the Nobel Prize.
The blood grouping system plays a very important role during the blood transfusion. If another blood type is introduced into our body, our immune system recognizes it as foreign and attacks it, resulting in a transfusion reaction. Mismatches with the ABO and Rh blood types result in most serious and life-threatening transfusion reactions. Hence, it is advisable to have a blood group checked before the blood transfusion.
Group A – contains antigen A and antibody B.
Group B –contains antigen B and antibody A.
Group AB –contains both A and B antigen and no antibodies (neither A nor B).
Group O – contains neither A nor B antigen and both antibodies A and B.