In the digestive system, peristalsis is ________.
A) a process of fat emulsification in the small intestine
B) voluntary control of the rectal sphincters regulating defecation
C) the transport of nutrients to the liver through the hepatic portal vessel
D) smooth muscle contractions that move food along the esophagus

Question

Quizplus · Accepted Answer

Peristalsis refers to smooth muscle contractions that move food along the esophagus. A is incorrect because fat emulsification occurs through bile in the small intestine. B is incorrect because defecation is regulated by involuntary reflexes. C is incorrect because hepatic portal circulation is responsible for transporting nutrients from the small intestine to the liver, but peristalsis specifically refers to the movement of food in the esophagus.

In the Digestive System, Peristalsis Is ________