ABO Blood Types, 2

Blood type is determined by the presence or absence of specific antigens named A and B, molecules that are attached to red blood cells.

 

     - Type A: individuals with Type A have an A antigen on red blood cells and B antibodies in their plasma (the almost transparent liquid that is part of the blood).

  -    B: individuals with Type B have the B antigen on red blood cells and A antibodies in their plasma.

 -  Type AB: individuals with Type AB have both A and B antigens on red blood cells but neither A nor B antibodies in their plasma.

 -   Type O: individuals with Type O have neither A nor B antigens on their red blood cells but have both A and B antibo

dies in their plasma.