Question

Lymphocytes in the lamina propria secrete large amounts of:

1) IgD
2) MHC I
3) Complement molecules
4) IgA
5) Gamma delta TCR

Answer 1

Lymphocytes in the lamina propria primarily secrete IgA, which is important for mucosal immunity in bodily secretions.

Step-by-step explanation:

The lymphocytes within the lamina propria, which is part of the mucosa-associated lymphoid tissue (MALT), primarily secrete IgA. IgA is critical for mucosal immunity and is found in large amounts in secretions such as saliva, tears, breast milk, and the gastrointestinal tract. Plasma cells in the lamina propria differentiate from B cells and are the primary source of IgA, especially in the form of dimeric molecules linked with a J chain. The secretion of IgA at mucosal surfaces is an essential element of the local immune response, as it can neutralize pathogens and prevent the infection of the mucosa.