General Science • BiologyMedium
Which immunoglobulin antibody is primarily secreted in mucosal secretions such as saliva, tears, and colostrum?
A. IgG
B. IgM
C. IgA✓ Correct Answer
D. IgE
💡 Solution & Explanation
Immunoglobulin A is the primary antibody class present in external mucosal secretions such as saliva, tears, colostrum, and respiratory tracts, providing critical defense against localized pathogen invasion. Immunoglobulin G dominates systemic blood circulation, whereas IgE mediates allergic reactions.
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