GENERAL HISTOLOGY

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: -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.

Detailed explanation-3: -Final answer: HCl Is secreted by Parietal Cell of the stomach.

Detailed explanation-4: -Hydrochloric acid secretion by the gastric parietal cell is necessary for pepsinogen activation (pH<5) and for the reduction of bacterial colonization. The main stimulants of gastric acid secretion are histamine, gastrin, and acetylcholine.

Detailed explanation-5: -Acid secretion is initiated by food: the thought, smell, or taste of food effects vagal stimulation of the gastrin-secreting G cells located in the distal one third (antrum) of the stomach. The arrival of protein to the stomach further stimulates gastrin output.