Assertion: esophagus's muscle | /r/CapableOf | call lower esophageal sphincter
Facets:
Source sentences:
text: But first a ring-like muscle at the bottom of your esophagus, called the lower esophageal sphincter, has to relax to let the food in.
text: At the top of esophagus is a band of muscle called the upper esophageal sphincter and another band of muscles called the lower esophageal sphincter is placed slightly above the stomach.