THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Hydrochloric acid secreted from gastric parietal cells generates the strongly acidic environment of the gastric lumen (pH <2) (305), which kills food-derived bacteria, facilitates food digestion, and promotes absorption of minerals including phosphate, calcium, and iron.

Detailed explanation-2: -Gastrin is a peptide hormone primarily responsible for enhancing gastric mucosal growth, gastric motility, and secretion of hydrochloric acid (HCl) into the stomach.

Detailed explanation-3: -Parietal cells (also known as oxyntic cells), are the stomach epithelial cells that secrete gastric acid (HCl) and intrinsic factor.

Detailed explanation-4: -The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria.