Question

Which one of the following statements is incorrect?

• A. Oxyntic cells are present in the mucosa of stomach and secrete HCl
• B. Acini are present in pancreas and secrete carboxypeptidase
• C. Brunner’s glands are present in the submucosa of stomach and secrete pepsinogen
• D. Goblet cells are present in the mucosa of intestine and secrete mucus

Answer 1

The correct option is C Brunner’s glands are present in the submucosa of stomach and secrete pepsinogen

Brunner’s glands are the glands that are present in the submucosa of the duodenum. The function of this gland is to secrete an alkaline fluid that contains mucin.This protects the duodenal mucosa from the acidic contents that enter the duodenum from the stomach.

Oxyntic cells or parietal cells are the cells of the gastric glands of the stomach. They secrete hydrochloric acid which is required for activating the inactive proenzyme pepsinogen into the active enzyme, pepsin. The oxyntic cells also secrete Castle’s intrinsic factor that is required for the absorption of vitamin $B_{12}$ in our body.

Pancreatic juice is composed of digestive enzymes and bicarbonate ions. The digestive enzymes are secreted by the exocrine acinar cells of the pancreas whereas the bicarbonate ions are secreted by the epithelial cells present in the pancreatic duct.

The mucosal epithelium of the intestine contains goblet cells which secrete mucus. The function of the intestinal mucus layer is to protect the epithelium of the intestine from pathogenic invasion.