Blood transfer is limited by the type and Rh factor of the blood. Someone who has Rh-factor negative blood cannot receive blood with a positive type but a person with Rh-factor positive type blood can receive Rh-negative blood. Type O negative blood is the universal donor because it can be given to a person with any blood type. Type AB positive is the universal recipient meaning someone with this blood type can receive any other type of blood.
Someone who has Rh-factor __________ blood cannot receive blood with a __________ type.
positive, antigen |
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antigen, negative |
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negative, positive |
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positive, negative |