Skin, mucus secretions and lysozyme in tears belong to the
Correct answer: A. first line of defence
- A. first line of defence
- B. second line of defence
- C. third line of defence
- D. adaptive immune system
Explanation
These physical and chemical barriers stop most pathogens from entering at all, before any cellular response is needed. Phagocytosis and inflammation form the second line, and specific immunity the third.
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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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