The pyloric sphincter is a tape of smooth muscle at the junction in between the pylorus the the stomach and also the duodenum that the tiny intestine. It plays an important role in digestion, where it acts as a valve come controls the flow of partly digested food indigenous the stomach to the tiny intestine.

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Anatomy

The pyloric sphincter is a thin, circular tape of visceral muscle surrounding the pyloric opened at the inferior finish of the stomach. It is uncovered at the border that the stomach’s final segment, the pylorus, and also the small intestine’s first segment, the duodenum. Proceed Scrolling to Read an ext Below...

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continued From Above... The pylorus is tapered and also funnel-shaped, narrowing native the large body of the stomach come only about an customs in diameter in ~ the pyloric sphincter.

Physiology

The pyloric sphincter plays necessary roles in regulating the rate of digestion and also the direction of chyme movement in the gastrointestinal tract. Food in the stomach is mixed with gastric juice developed by the stomach to kind a thick, acidic liquid referred to as chyme. Following a meal, the stomach shop chyme both to begin its digestion and to enable the rest of the digestive system sufficient time to digest the food thoroughly. The pyloric sphincter remains closed during eating and while the stomach mixes food through gastric juice to kind chyme.

After the stomach has actually completed its cradle role, the pyloric sphincter starts to convulse in tide of peristalsis to press chyme toward the pylorus. Together each peristaltic tide reaches the pylorus, the pyloric sphincter briefly opens to allow a little mass that chyme come pass into the duodenum. Tide after tide of peristalsis progressively empty the stomach end a duration of around 30 minutes to an hour.

The pyloric sphincter prevents the regurgitation the chyme from the duodenum right into the stomach. It likewise controls the circulation of chyme into the intestine, which gives the intestines v a controlled volume the chyme from which to absorb nutrients.

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