Multiple Choice
How is chyme different from a bolus in the digestive process?
23. The Digestive System
Introduction to the Digestive System
Multiple Choice
What is the outermost layer of the digestive tract wall?
A
Serosa
B
Mucosa
C
Submucosa
D
Muscularis
Verified step by step guidance1
Understand the structure of the digestive tract wall, which consists of four main layers: mucosa, submucosa, muscularis, and serosa.
The innermost layer is the mucosa, which is responsible for secretion and absorption.
The next layer is the submucosa, which contains blood vessels, nerves, and glands.
The muscularis layer follows, consisting of smooth muscle responsible for peristalsis and segmentation.
The outermost layer is the serosa, which is a protective layer that reduces friction between the digestive organs and surrounding structures.
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