Secretory immunoglobulin is_____________?
Correct answer: B. IgA
- A. IgG
- B. IgA
- C. IgM
- D. IgE
Explanation
Secretory immunoglobulin is predominantly IgA, found in saliva, tears, breast milk and mucosal secretions. Its main role is to protect mucosal surfaces rather than circulate as the major serum antibody.
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