A circular muscle that can open and close and acts to regulate the flow of materials in one direction is referred to as ________.

Question

Quizplus · Accepted Answer

A sphincter is a circular muscle that can open and close and acts to regulate the flow of materials in one direction. Enterohepatic circulation refers specifically to the recycling of bile acids between the liver and small intestine. A pump refers to a device that moves fluids or gases through a system. Peristalsis refers to the coordinated muscular contractions that move materials through the digestive tract.

A Circular Muscle That Can Open and Close and Acts