What is the function of the pyloric sphincter?

The pyloric sphincter serves a crucial role in the digestive system by controlling the passage of partially digested food, known as chyme, from the stomach into the duodenum, which is the first part of the small intestine. This muscular valve remains closed while the stomach processes food, ensuring that it is sufficiently mixed and broken down before being released in small amounts into the duodenum for further digestion and nutrient absorption.

In addition to its primary function, the pyloric sphincter also helps regulate the flow of the contents based on the digestive needs. When the small intestine is ready to receive more food, the pyloric sphincter relaxes to allow chyme to pass through. This mechanism is vital for maintaining proper digestion and preventing backflow of intestinal contents into the stomach.

While other options refer to processes that occur within different systems or parts of the digestive system, the specific function of the pyloric sphincter is accurately described by its role in controlling the passage from the stomach to the duodenum.