What do sphincter muscles do?
A) Control peristalsis.
B) Mix food with saliva.
C) Secrete digestive juices into the GI tract.
D) Regulate the flow of food particles along the GI tract.
E) Trigger hormone release.

Question

What do sphincter muscles do? 
A) Control peristalsis. 
B) Mix food with saliva. 
C) Secrete digestive juices into the GI tract. 
D) Regulate the flow of food particles along the GI tract. 
E) Trigger hormone release.

Quizplus · Accepted Answer

Sphincter muscles regulate the flow of food particles along the gastrointestinal (GI) tract by contracting and relaxing to allow or prevent the movement of food.

What Do Sphincter Muscles Do