The antibody found in high concentration in colostrum, saliva and tears is
Correct answer: D. IgA
- A. IgG
- B. IgM
- C. IgE
- D. IgA
Explanation
IgA is secreted onto mucous surfaces and into milk, where it neutralises pathogens at the point of entry before they can invade, which is one strong reason for breastfeeding. It works outside the tissues, so it is not the antibody that crosses the placenta. IgM, being very large, stays in the bloodstream, and IgE is bound to mast cells rather than free in secretions.
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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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