Pyloric sphincter

Definition

The pyloric sphincter is a ring of smooth muscle located between the stomach and the duodenum. It regulates the passage of partially digested food from the stomach to the small intestine.

5 Must Know Facts For Your Next Test

1. The pyloric sphincter prevents backflow of intestinal contents into the stomach, which helps maintain an acidic environment necessary for digestion.
2. It plays a crucial role in controlling the rate at which the stomach empties its contents into the duodenum, affecting nutrient absorption.
3. Dysfunction of the pyloric sphincter can lead to conditions such as gastroparesis or pyloric stenosis, impacting digestion.
4. Normal microbiota in the stomach and duodenum can influence the function of the pyloric sphincter by interacting with gastric and duodenal tissues.
5. Infections like Helicobacter pylori can affect the function and integrity of the pyloric sphincter, leading to gastrointestinal diseases.

Review Questions

Related terms

Duodenum:

The first part of the small intestine immediately beyond the stomach.

Gastroparesis: A condition where there is delayed emptying of stomach contents due to impaired motility.

Helicobacter Pylori: A type of bacteria that infects your stomach and can lead to ulcers and other gastrointestinal issues.