If a B cell has been activated by antigen in the mucosa of the respiratory tract, then _____. (Select all that apply.)
a. lactating mothers will provide antigen-specific natural IgA in breast milk
b. secretory IgA will be synthesized in the lamina propria of all mucosae
c. it does not enter the bloodstream but instead remains in the mucosa and differentiates into an effector B cell
d. it will recirculate through all mucosal tissues, including respiratory and gastrointestinal mucosae
e. monomeric IgA is secreted into the lamina propria.
a, b, d
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