Question

Which of the following best describes small intestinal motility?

A. Contractile activity is initiated in response to bowel wall distention.

B. Contractile frequency is constant from duodenum to terminal ileum.

C. Migrating motor complexes (MMCs) occur during the digestive period.

D. Peristalsis is the only contractile activity that occurs during feeding.

E. Vagotomy abolishes contractile activity during the digestive period.

Answer 1

Answer :) Option D

The peristalsis in the small intestine, firstly, the longitudinal muscles inside the small intestine wall are contracted, and then the circular muscles contract, by both contractions the food pushes down the tract. Therefore, peristalsis occurs during the digestion of food. However, peristalsis starts in the esophagus and ends in the rectum. Therefore, option D is the correct answer. The other motion found in the small intestine is segmentation contractions.