Functions of the Stomach

Functions of the Stomach

The Stomach The stomach is an expanded J-shaped organ in the upper left region of the abdominal cavity (Fig. 15-7). In addition to the two muscle layers already described, it has a third, inner oblique (angled) layer that aids in grinding food and mixing it with digestive juices. The left-facing arch of the stomach is the greater curvature, whereas the right surface forms the lesser curvature. The superior rounded portion under the left side of the diaphragm is the stomach’s fundus.Sphincters A sphincter is a muscular ring that regulates the size of an opening. There are two sphincters that separate the stomach from the organs above and below. Between the esophagus and the stomach is the lower esophageal sphincter (LES). This muscle has also been called the cardiac sphincter because it separates the esophagus from the region of the stomach that is close to the heart. We are sometimes aware of the existence of this sphincter when it does not relax as it should, producing a feeling of...
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