Multiple Choice
Which enzyme breaks down protein-forming polypeptides in the stomach?
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23. The Digestive System
Introduction to the Digestive System
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Which layer of the digestive tract secretes a fluid that reduces friction with other organs?
A
Submucosa
B
Mucosa
C
Muscularis externa
D
Serosa
Verified step by step guidance1
Understand the structure of the digestive tract, which consists of several layers: mucosa, submucosa, muscularis externa, and serosa.
Recognize the function of each layer: the mucosa is involved in secretion and absorption, the submucosa contains blood vessels and nerves, the muscularis externa is responsible for peristalsis, and the serosa is the outermost layer.
Identify the role of the serosa, which is a smooth membrane that secretes a serous fluid.
Learn that the serous fluid secreted by the serosa reduces friction between the digestive tract and surrounding organs during movement.
Conclude that the serosa is the layer responsible for secreting the fluid that reduces friction with other organs.
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