The esophagus
A) extends from the fauces to the stomach.
B) has cartilage in its walls to keep it from collapsing.
C) produces two enzymes that digest proteins.
D) has upper and lower sphincters to regulate movement of food.
E) has thin walls of connective tissue.

Question

Quizplus · Accepted Answer

The esophagus has upper and lower sphincters, known as the upper esophageal sphincter and the lower esophageal sphincter (or cardiac sphincter), which help regulate the movement of food into and out of the esophagus.

The Esophagus