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What is the function of the pyloric sphincter?

Answer 1

Prevents the passage of food particle to small intestine (duodenum) until proper mixture with gastric juice.
Prevents backflow from intestine to stomach.

The stomach wall has three layers of smooth muscles. The outer layer is longitudinal, the middle layer is circular and the inner layer is oblique. At pylorus, the middle circular layer is greatly thickened (50 to 100 percent greater than in earlier portion) to form pyloric sphincter.

The sphincter remains slightly tonically contracted almost all the time. But it is usually open enough for water and other fluid to pass from stomach to intestine.

The constriction of sphincter prevents the foods to empty into intestine until foods are mixed well with gastric juice (containing HCl and enzymes). This mixing results in chyme, which has almost fluid consistency.

Pyloric sphincter also prevents backflow of chyme from intestine (duodenum) to stomach.

Anatomy of stomach, see the position of pyloric sphincter :

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Answer 2

David Arnold

The pyloric sphincter controls the flow of partially digested food from the stomach to the small intestine.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.