IMMUNOLOGY

Detailed explanation-1: -Peyer’s patches Their main function is the production of immunoglobulin A (IgA) along with other types of immunoglobulins. The epithelial cells covering areas of Peyer’s patches can be identified as ‘M’ cells with micropinocytic properties, allowing the cells to sample antigens.

Detailed explanation-2: -The human body contains as many as 5 × 1011 lymphocytes, which travel through the blood each day. Naïve T lymphocytes and B lymphocytes enter the lymph nodes or Peyer’s patches by selectively adhering to and transmigrating through the high endothelial venules.