You may also have diarrhea or a fever. It is sometimes called stomach flu, but it is not the flu. Germs like viruses and bacteria can cause it. You can catch it from someone else who has it, or you can get it from food poisoning. Food poisoning can happen if you eat foods that contain harmful germs.
The circular muscle located at the entrance and exit to the stomach is called the sphincter. So for this question, you are talking about two distinct sphincters. This anatomical structure is able to open, and contract or close as needed.
Stomach Location. Stomach is a muscular bag forming the most distensible part of the Human Digestive System. The regions occupied by stomach are epigastric, umbilical and hypochondriac regions. It lies between the esophagus and the duodenum on the upper-left portion of the abdominal cavity.Stomach is divisible into cardiac portion which in turn is divided into fundus and body whereas the pyloric division of the stomach is further sub-divided into pyloric antrum and pyloric canal.tomach Location. Stomach is a muscular bag forming the most distensible part of the Human Digestive System. The regions occupied by stomach are epigastric, umbilical and hypochondriac regions. It lies between the esophagus and the duodenum on the upper-left portion of the abdominal cavity.