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Ch. 23 The Digestive System
Chapter 22, Problem 10

The sphincter between the stomach and duodenum is a. the pyloric sphincter, b. the gastroesophageal sphincter, c. the hepatopancreatic sphincter, d. the ileocecal valve.

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1
Identify the location of each sphincter or valve mentioned in the options.
Understand the function of the sphincter or valve in relation to the digestive system.
Recall that the stomach connects to the duodenum, which is the first part of the small intestine.
Determine which sphincter is responsible for controlling the passage of food from the stomach to the duodenum.
Select the option that correctly names the sphincter located between the stomach and the duodenum.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Pyloric Sphincter

The pyloric sphincter is a muscular valve located at the junction of the stomach and the duodenum. Its primary function is to regulate the passage of partially digested food (chyme) from the stomach into the small intestine, ensuring that it is released in a controlled manner for optimal digestion and absorption.
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Gastroesophageal Sphincter

The gastroesophageal sphincter, also known as the lower esophageal sphincter, is located at the junction of the esophagus and the stomach. It prevents the backflow of stomach contents into the esophagus, playing a crucial role in protecting the esophageal lining from acidic gastric juices.
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Hepatopancreatic Sphincter

The hepatopancreatic sphincter, also known as the sphincter of Oddi, controls the flow of bile and pancreatic juices into the duodenum from the liver and pancreas. This sphincter is essential for the digestion of fats and the neutralization of stomach acid as chyme enters the small intestine.
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