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Within the stomach, there are three different substance that help in digestion. Salivary amylase enters the stomach from salivary ducts in the mouth which helps break down sugars like starch. Pepsin is an enzyme that aids in the breakdown of proteins and is secreted through glands within the stomach. Hydrochloric acid is also secreted by the stomach and the main function of that is to kill harmful bacteria within the stomach. The main digestion happens in the small intestine when the chyme enters the duodenum and sodium bicarbonate is added by the pancreas.

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