The stomach is an organ of the digestive system, but it also secretes a Hormone. What hormone is it and what function does it perform?

Question

The stomach is an organ of the digestive system, but it also secretes a Hormone. What hormone is it and what function does it perform?

Accepted Answer

Entrance of Food in the stomach:

When food enters the stomach, the gastric glands found in the stomach wall are stimulated to secrete gastric juice. It is composed chiefly of mucous, hydrochloric acid, and a protein-digesting enzyme pepsinogen.

Functions of Hydrochloric acid:

Hydrochloric acid converts the inactive enzyme pepsinogen into its active form called pepsin, HCI also kills microorganisms present in food. Pepsin partially digests the protein portion of the food (the bulk of mutton) into polypeptide and shorter peptide chains.