<prompt> Submucosal glands are present in the following pa of gastro intestinal tract?DuodenumColonAnal canalStomach  <response>: The major distinguishing feature of this C-shaped first pa of the small intestine duodenum is the presence of duodenal Brunners glands in the submucosa. The mucous cells of these glands produce an alkaline secretion pH 8.1-9.3 that enters the lumen through the crypts. It protects the duodenal lining from the acidity of the chyme and raises the luminal pH to optimize pancreatic enzyme activity. 