Why stomach acids corrode the intestines?

Stomach acids do not corrode the intestines. The stomach is a muscular organ that churns food and mixes it with stomach acids to break it down. The acids in the stomach are hydrochloric acid and pepsin. Hydrochloric acid kills bacteria and helps to break down proteins. Pepsin is an enzyme that helps to break down proteins. The intestines are lined with a layer of mucus that protects them from the stomach acids.