Assertion: esophagus's muscle | /r/LocatedNear | digestive tract
Facets:
Source sentences:
text: The muscular contractions which move food through the digestive system by systematically contract the smooth muscle surrounding the digestive tract.
text: Food is propelled in this direction by peristalsis, or peristaltic contractions; these are alternating involuntary contractions and relaxations of smooth muscle surrounding the digestive tract.