Multiple Choice
Where are most fat-digesting enzymes produced in the human body?
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23. The Digestive System
Introduction to the Digestive System
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Which of the following is the innermost layer of the digestive tract?
A
Muscularis externa
B
Mucosa
C
Submucosa
D
Serosa
Verified step by step guidance1
Begin by understanding the structure of the digestive tract, which consists of several layers. These layers, from innermost to outermost, are mucosa, submucosa, muscularis externa, and serosa.
The innermost layer, the mucosa, is responsible for absorption and secretion. It is composed of three sub-layers: the epithelium, lamina propria, and muscularis mucosae.
The submucosa is the next layer outward and contains blood vessels, nerves, and glands that support the mucosa.
The muscularis externa is responsible for peristalsis and segmentation, consisting of an inner circular layer and an outer longitudinal layer of muscle.
The outermost layer, the serosa, is a protective layer that reduces friction between the digestive organs and surrounding structures.
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