What is the organ in the human body that secretes hydrochloric acid?

Hydrochloric acid is an important component of the digestive system as it helps in breaking down food and killing germs. 

The stomach is the organ responsible for secreting hydrochloric acid in the human body. 

The stomach lining produces this acid, which creates an acidic environment that facilitates the action of protein-digesting enzymes. 

Hydrochloric acid also serves as a natural defence mechanism by destroying any harmful bacteria or viruses that may have entered the digestive system with the food.