True about histology of small intestine is A/E: (A) Zone of replication is in lower half of gland, (B) M cells convey microorganism to peyer's patches, (C) GALT is absent in lamina propria, (D) SIgA provides mucosal immunity
Answer is C. C i.e. GALT is absent in lamina propria- Zone of replication (intestinal stem cell niche) is restricted to lower half of intestinal gland (crypts of Lieberkuhn).- Microfold (M) cells are antigen transpoing cells that convey microorganisms & macromolecules from intestinal lumen to Peyer's patches.- Close entero endocrine cells are resting non secretory cells . Whereas open cells secrete CCK, secretin, GIP, motilin, gastrin & ghrelin hormones.- GALT is prominent in lamina propria of small intestine . Secretory IgA is principle molecule of mucosal immunity