Human blood is grouped into ______ main types.
four
The correct answer is four.
Transfusing blood of an incompatible ABO type can lead to a severe immune response where the recipient's antibodies attack the transfused red blood cells. This reaction, called a hemolytic transfusion reaction, can cause fever, chills, kidney damage, and even death. Understanding blood types is also vital in genetics, paternity testing, and forensic science. Blood type inheritance follows specific patterns based on the alleles received from parents.
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