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An excerpt from Liebow, Charles. "Stomach." World Book Online Reference Center. 2005. World Book, Inc. 14 Mar. 2005. <http://www.aolsvc.worldbook.aol.com/wb/Article?id=ar534380>. Glands in the stomach wall secrete mucus to lubricate the food. Other glands give off hydrochloric acid and the enzyme pepsin to help digest the food, and a substance called intrinsic factor to aid the absorption of vitamin B-12. The hydrochloric acid kills many microorganisms (tiny living organisms such as bacteria) in the food.
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