The walls consists of four layers of connective tissue, blood vessels, nerves, and muscle fibers. The inner lining, called the mucosa, secretes gastric juices through special glands buried in the lining. Beneath the mucosa, a supporting layer called the submucosa covers the muscle layer, which is responsible for the contractions that occur during digestion. The serosa is the stomach’s thin, outer layer of cells. Large, vertical folds line the stomach, allowing fluids to flow easily to the duodenum at the lower end of the stomach.
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