BLOOD 

 GROUPS 



CZ:? 



Fig. 19-17. A schematic representation of the various blood groups (A, B, AB, O) and what 

 happens when they are mixed. Agglutination occurs when the red cells of a certain type 

 are mixed with the sera containing a specific antibody. The antibodies are indicated by 

 specifically shaped particles that fit into the spaces cut out of the circular discs which 

 represent the red blood cells. When they fit agglutination occurs. See text for a further 

 explanation. 



