Final answer:
In the ABO blood typing system, individuals with type A blood have antigens A on their erythrocytes, while individuals with type B blood have antigens B on their erythrocytes. People with type O blood are considered universal donors because their blood does not elicit an immune response when injected into a person of any blood type. People with type AB blood can accept blood from any type and are considered universal acceptors.
Step-by-step explanation:
In the ABO blood typing system, individuals with type A blood have antigens A on their erythrocytes, while individuals with type B blood have antigens B on their erythrocytes. Type AB blood has both antigens, and type O blood has neither. These antigens can elicit an immune response if an individual receives a transfusion with incompatible blood. People with type O blood are considered universal donors because their blood does not elicit an immune response when injected into a person of any blood type. People with type AB blood can accept blood from any type and are considered universal acceptors.