<prompt> Major immunoglobulin secreted by intestine -IgGIgMIgAIgD  <response>: Ans. is c i.e., IgA IgAo It is the second most abundant antibody after IgG.o It is major immunoglobulin in dost rum, saliva, tears, respiratory and gastrointestinal secretions. Ig A occurs in two forms.o Slg A and J chain are synthesized by plasma cells.o Secretory component is produced by mucosal or glandular epithelial cells.o Two subclasses of IgA have been described Ig A. Ig A,.IgA1-predominant serum IgAIgA2-predominant secretory IgA 