_____ is a circular muscle that acts as a valve, opening and closing to allow the gastric contents to move throughout the GI tract.
A) Connective tissue
B) The lumen
C) A sphincter
D) The rectum

Question

Quizplus · Accepted Answer

A sphincter is a circular muscle that acts like a valve, controlling the flow of fluids and materials through various parts of the body. One such sphincter is found at the end of the esophagus and beginning of the stomach, regulating the movement of food and gastric juices into the stomach and preventing backflow into the esophagus.

_____ Is a Circular Muscle That Acts as a Valve