Function of Ig A is________________?
Correct answer: A. Acts as a mucosal barrier for infection
- A. Acts as a mucosal barrier for infection
- B. Circulating antibody
- C. Kills virus infected cells
- D. Activates macrophages
Explanation
IgA, especially secretory IgA, forms a mucosal barrier by neutralising microbes and blocking their attachment to epithelial surfaces. It is not primarily the circulating antibody, and it does not kill infected cells like cytotoxic lymphocytes do.
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