Muscular contractions, called peristalsis, also aid in digestion. The stomach releases gastric juices containing hydrochloric acid and the enzyme, pepsin, which initiate the chemical digestion of protein. As illustrated in the image below, both mechanical and chemical digestion take place in the stomach. The mashed egg pieces enter the stomach from the esophagus. In the image below, follow the numbers to see what happens to the protein in our egg at each site of digestion.įig. One egg, whether raw, hard-boiled, scrambled, or fried, supplies about six grams of protein. Let’s follow the path that proteins take down the gastrointestinal tract and into the circulatory system.Įggs are a good dietary source of protein and will be used as our example as we discuss the processes of digestion and absorption of protein. When you eat food, the body’s digestive system breaks down dietary protein into individual amino acids, which are absorbed and used by cells to build other proteins and a few other macromolecules, such as DNA.
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