Chapter 26.1, Problem 5WDL

Summary Introduction

To determine:

The difference between peristalsis and mixing.

Concept introduction:

Muscularis layer of GI tract is made up of two smooth muscle layer in which the cells of inner smooth muscle layer are arranged in the wall of GI tract circumferentially forming the “inner circular layer”. The cells of outer smooth muscle are arranged as “outer longitudinal layer”. The contraction of these two layers forces ingested food to move along the GI tract in two types of movement: mixing and peristalsis.