Question

what control the opening and closing of gastric sphincter

Answer 1

Pyloric Sphincter Definition

The pyloric sphincter is a small piece of smooth visceral muscle that acts as a valve and regulates the flow of partially digested food from the stomach to the duodenum. The opening and closing of the sphincter is controlled by peristaltic waves produced by the stomach during the digestion process. At rest, the sphincter remains partially open to allow the free flow of water into the duodenum; however it immediately closes in the presence of food to allow digestion to occur.