The stomach is a muscle body organ located on the left side of the top abdominal area. The stomach obtains food from the esophagus. As food reaches the end of the esophagus, it goes into the stomach via a muscle valve called the reduced esophageal sphincter.
The stomach secretes acid and also enzymes that absorb food. Ridges of muscle tissue called rugae line the stomach. The stomach muscular tissues agreement occasionally, churning food to enhance digestion. The pyloric sphincter is a muscular valve that open up to allow food to pass from the stomach to the small intestine.