Assertion: esophagus's sphincter | /r/HasProperty | closed
Facets:
value: normally
type: DEGREE
value: during the oral phase
type: TEMPORAL
value: except during swallowing
type: TEMPORAL
Source sentences:
text: Normally, the upper and lower sphincters are closed except during swallowing, which prevents constant entry of air from the oral cavity or reflux of stomach contents.
text: During the oral phase, the upper esophageal sphincter is closed, and food will not be able to pass in the esophagus until it is open.
text: The swallowing reflex controls whether the sphincters are open or closed.
text: The upper esophageal sphincter is normally closed.