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Unformatted text preview: within the muscularis of the stomach assists in these processes ( see Figure 3 ). The secretion of pepsinogen from the chief cells begins the chemical digestion of proteins. HCl , which activates pepsin and breaks down connective tissues and plant materials , is secreted from the parietal cells . Mucous/goblet cells secrete a sticky mucus that protects the epithelia tissue layer of the stomach from chemical digestion. These secretions can be regulated by the brain , the stomach itself, or the duodenum . Very little nutrient absorption occurs in the stomach. Figure 3...
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- Fall '10