Question

The opening of the stomach in duodenum is regulated by
A. Sphincter of oddi
B. Pyloric sphincter
C. gastro -oesophageal
D. Ileo-caecal valve

Answer 1

Hint: The pyloric canal ends because the pyloric orifice marks the joint in the middle of the stomach and therefore the duodenum. The orifice is surrounded by a sphincter, a band of muscle, called the pyloric valve .

Complete answer:
Let's discuss the choice and find the right answer.
-Sphincter of oddi: The sphincter of ampulla or sphincter of Oddi may be a muscular valve . Through the ampulla of Vater into the second part of the duodenum it controls the flow of digestive juices (bile and pancreatic juice) . It surrounds the exit of the common bile duct and duct into the duodenum, at the papilla of Vater. The opening of the hepatopancreatic duct into duodenum is Sphincter of Oddi . Hence option A is wrong .
-Pyloric sphincter :The pyloric valve may be 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.Pyloric sphincter is found between the duodenum and posterior stomach. It regulates the opening of duodenum into the stomach. Hence option B is correct.
-gastro -oesophageal :The sphincter thus allows material to pass from the esophagus to the stomach during deglutition, but acts as a barrier to reflux of gastric contents under resting conditions. The nervous control of the function of the sphincter isn't completely understood. -Gastro-oesophageal sphincter is found between the oesophagus and stomach. Hence option C is wrong .
-Ileo-caeeal valve : The valve may be a sphincter situated at the junction of the ileum (last portion of your small intestine) and therefore the colon (first portion of your large intestine). Its function is to permit digested food materials to pass from the tiny intestine into your intestine . Ileo-caecal valve is present between the ileum of the tiny intestine and caecum of the huge intestine. Hence option D is wrong .
Hence option B: pyloric sphincter is the correct answer.

Note: The opening and shutting of the sphincter are controlled by peristaltic waves produced by the stomach during the digestion process. The sphincter that helps in opening of the stomach into the duodenum is pyloric. The massive protein molecules of the food are de-escalated into smaller segments of the stomach which are referred to as chyme. The pyloric helps in regulating the duodenum.