Name and differentiate the four main blood types. Describe the reaction that occurs when the body is exposed to antigens that are not in their blood....

Name and differentiate the four main blood types. 

Describe the reaction that occurs when the body is exposed to antigens that are not in their blood.

What two reactions will occur if a person receives a transfusion of blood with antigens that do not match. 

What test must be done before anyone can receive a transfusion?