Peristalsis
A) is under voluntary control.
B) involves the opening and closing of muscular sphincters.
C) involves back-and-forth movement for mixing.
D) is the alternating contraction of muscle layers in the GI tract wall that propels materials through the tract.
E) All of the choices are correct.

Question

Quizplus · Accepted Answer

Peristalsis is an involuntary process involving the alternating contraction and relaxation of muscle layers in the gastrointestinal tract wall, which propels materials through the digestive system.