What is the primary function of the pyloric sphincter?

The primary function of the pyloric sphincter is to control the passage of chyme into the small intestine. This muscular valve, located at the junction between the stomach and the duodenum (the first part of the small intestine), regulates how much partially digested food, known as chyme, is released from the stomach. It opens to allow small amounts of chyme to pass into the small intestine for further digestion and nutrient absorption, while remaining closed to prevent backflow of intestinal contents into the stomach.

This crucial role ensures that the digestive process moves smoothly and that the small intestine is not overwhelmed by too much chyme at once, which could disrupt digestion and absorption. The pyloric sphincter is essential for maintaining the correct timing and flow of digestion, making its function vital for overall gastrointestinal health.