The digestive system

The stages of digestion

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The stomach

What chemical transformations take place in the stomach?

The stomach wall has integrated gastric glands that secrete gastric juices. The hydrochloric acid in these juices acidifies food and destroys some of the bacteria in the stomach. Gastric juices also contain enzymes such as pepsin, which breaks down proteins into small chains of amino acids called peptides.

The main role of gastric lipase is to attack complex lipids and transform them into simple lipids.

What mechanical transformations take place in the stomach?

Contractions of the stomach mix the bolus of food and gastric juices into a highly acidic thick fluid called chyme. Some of the complex nutrients are transformed into simpler ones. The contents of the stomach are continuously emptied into the duodenum.

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