Question

What is the function of secretory protein in IgA?

• A. Helps in the secretion of IgA as a dimer
• B. Helps in the secretion of monomeric IgA
• C. Helps the IgA to bind to pathogens in saliva
• D. Helps in its secretion as a serum immunoglobulin

Answer 1

The correct option is A

Helps in the secretion of IgA as a dimer

IgA is the predominant immunoglobulin in bodily secretions such as breast milk, saliva, tears and mucus. In serum, IgA exists predominantly as a monomer, but the ‘secretory IgA’, that is the IgA in breast milk and other fluids is a dimer, connected by a secretory protein that enables its secretion.