Mucus

• Mucus secretions protect the stomach from the other chemicals in gastric juice. If mucus were not produced, your stomach would digest itself. In fact, your stomach makes a new lining every seven days for that very reason.
  
  

Hydrochloric Acid

• The stomach cells secrete hydrogen ions and chloride ions, which is the equivalent to hydrochloric acid. The acid kills bacteria, slightly denatures food protein, and causes bile and pancreatic juice production.
  
  

Intrinsic factor

• Parietal cells produce intrinsic factor, which aids in the absorption of vitamin B12, a nutrient used in red blood cell formation.
  
  

Pepsinogen

• Pepsinogen is the inactive form of pepsin. Hydrochloric acid activates pepsinogen, converts it to pepsin and allows it to begin protein digestion by breaking the bonds between amino acids.
  
  

Gastric Lipase

• Gastric lipase is a stomach enzyme that breaks down fat molecules' short-chain triglycerides into monoglycerides and fatty acids. Gastric lipase works best in a pH of 5 to 6.