Question

The __________ is responsible for segmentation and peristalsis.

1) submucosa
2) serosa
3) mucosa
4) muscularis externa

Answer 1

The muscularis externa is responsible for segmentation and peristalsis in the alimentary canal.

Step-by-step explanation:

The muscularis externa is responsible for segmentation and peristalsis in the alimentary canal. It is the third layer of the canal and consists of two types of smooth muscle: the inner circular muscle and the outer longitudinal muscle. The contractions of these muscles promote mechanical digestion, expose more food to digestive chemicals, and move food along the canal through peristalsis.