Gastric juice is a very active fluid that consists of hydrochloric acid and various enzymes (which break down nutrients). Hydrochloric acid also has a detrimental effect on microorganisms that enter the stomach through the mouth.

The human digestive system begins with the oral cavity. Here the food is crushed and moistened with saliva. Further food enters the esophagus, from it – into the stomach. Then she moves and enters the