A kidney transplanted from another person is usually rejected because the recipient's immune system recognises foreign
Correct answer: B. self markers, the MHC proteins, on the donor's cells
- A. hormones on the organ
- B. self markers, the MHC proteins, on the donor's cells
- C. digestive enzymes
- D. phospholipids of the membranes
Explanation
Every person's MHC proteins are unique identity tags, and cytotoxic T cells attack any tissue carrying unfamiliar ones. Close matching of MHC between donor and recipient reduces this recognition.
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About Specific Defense Mechanism
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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