Which of the following statements best describes what you would expect to happen in a packed cell transfusion if the recipient had blood type A and the donor had blood type O?
1) The recipient's immune system will recognize the donor's blood as foreign and attack it.
2) The recipient's immune system will not react to the donor's blood.
3) The recipient's immune system will produce antibodies against the donor's blood.
4) The recipient's immune system will accept the donor's blood without any reaction.
