What is the sphincter at the end of the esophagus called?

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Multiple Choice

What is the sphincter at the end of the esophagus called?

Explanation:
The end-of-esophagus ring is the lower esophageal sphincter, also called the gastroesophageal sphincter. Its main job is to form the barrier between the esophagus and stomach, preventing stomach contents from refluxing upward. It relaxes briefly to allow a swallowed bolus to enter the stomach. The other sphincters sit in different locations: the upper esophageal sphincter is at the top of the esophagus, preventing air from entering the digestive tract; the pyloric sphincter sits between the stomach and the small intestine, regulating gastric emptying; the anal sphincter is at the end of the GI tract, controlling stool passage.

The end-of-esophagus ring is the lower esophageal sphincter, also called the gastroesophageal sphincter. Its main job is to form the barrier between the esophagus and stomach, preventing stomach contents from refluxing upward. It relaxes briefly to allow a swallowed bolus to enter the stomach. The other sphincters sit in different locations: the upper esophageal sphincter is at the top of the esophagus, preventing air from entering the digestive tract; the pyloric sphincter sits between the stomach and the small intestine, regulating gastric emptying; the anal sphincter is at the end of the GI tract, controlling stool passage.

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