The Pharynx and Esophagus

The Pharynx and Esophagus - within the muscularis of the...

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The Pharynx and Esophagus From the oral cavity, the bolus enters the oropharynx and then the esophagus . The epiglottis moves to block food from entering the larynx . Sphincters control the movement of food through the GI tract. Food is pushed through the esophagus by peristaltic contractions ( see Figure 2 ). Figure 2 Can you identify the regions of the pharynx in the activity below? The Stomach The stomach is a large muscular organ that chemically and mechanically breaks up ingested food, resulting in a liquefied material known as chyme . The stomach mechanically breaks up food particles by churning and mixing the food. An additional muscle layer that runs obliquely
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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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The Pharynx and Esophagus - within the muscularis of the...

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