Answer :
When a person breathes in, the sphincter contracts and closes, preventing air from going into the esophagus and instead allowing it to go into the larynx and the trachea.
What is superior esophageal sphincter?
The term "upper esophageal sphincter" (UES) refers to the area of the esophagus that is located between the pharynx and the cervical esophagus and has a higher pressure than the rest of the esophagus. This sphincter's function in the body is to defend against the backflow of food into the airways while also preventing air from entering the digestive system. It does this by acting as a barrier.
Acid that has flowed back into the esophagus can be able to enter the throat if the upper esophageal sphincter is damaged.
Therefore, the the superior esophageal sphincter is closed during inhalation of air, so that air doesn't enter the esophagus and enters the larynx and trachea instead.
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