Question

question 36
which of the following constricts so that chyme does not travel into the esophagus?
o the pyloric sphincter
o the pancreatic sphincter
o the lower esophageal sphincter
o the internal anal sphincter

Explanation:

The lower esophageal sphincter (LES) is a ring - like muscle at the bottom of the esophagus. Its main function is to prevent the backflow of chyme (partially digested food and gastric juices) from the stomach into the esophagus.
The pyloric sphincter controls the passage of chyme from the stomach to the small intestine.
The pancreatic sphincter is related to the flow of pancreatic juice.
The internal anal sphincter is involved in the control of fecal continence at the anal canal.

Answer:

the lower esophageal sphincter