Transfusing type A blood into a person with type B blood is dangerous because
Correct answer: B. the recipient's anti A antibodies agglutinate the donor red cells
- A. the donor cells are larger than the recipient's
- B. the recipient's anti A antibodies agglutinate the donor red cells
- C. both blood types destroy the plasma
- D. the mixture becomes hypertonic
Explanation
Type B plasma contains anti A antibodies that clump and lyse A cells, blocking capillaries. Matching blood groups before transfusion prevents this antigen antibody reaction.
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Specific defense mechanisms provide targeted immunity through B lymphocytes, T lymphocytes, antibodies and memory cells that recognize particular antigens. Questions cover humoral and cell mediated responses, clonal selection, primary and secondary immune responses, vaccination and passive immunity, while distinguishing adaptive defenses from the immediate, non specific innate response.
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