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Questions and Answers
Which layer of the alimentary canal is responsible for the production of mucus and acts as a lubricant for food passage?
Which layer of the alimentary canal is responsible for the production of mucus and acts as a lubricant for food passage?
- Mucosa (correct)
- Serosa
- Submucosa
- Muscularis externa
Which of the following correctly describes the composition of the muscularis externa?
Which of the following correctly describes the composition of the muscularis externa?
- Mesothelium and connective tissue
- Epithelium and lamina propria
- Muscularis mucosae and lamina propria
- Circular layer and longitudinal layer (correct)
Which layer of the alimentary canal is primarily responsible for protecting the mucosa?
Which layer of the alimentary canal is primarily responsible for protecting the mucosa?
- Muscularis externa
- Serosa
- Mucosa
- Submucosa (correct)
Which of the following is NOT a component of the mucosa?
Which of the following is NOT a component of the mucosa?
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What is the primary function of the serosa?
What is the primary function of the serosa?
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Study Notes
Layers of the Alimentary Canal
Serosa (Outer Layer)
- A thin membrane lining the closed cavities of the body
- Composed of mesothelium and connective tissue
Muscularis Externa
- Responsible for gut movement (peristalsis)
- Creates motion that churns and physically breaks down food
- Composed of two layers:
- Longitudinal layer
- Circular layer
Submucosa
- Third layer of the alimentary canal
- Protects the mucosa
Mucosa (Inner Most Layer)
- Moist inner lining of some organ cavities
- Composed of three layers:
- Muscularis mucosae
- Lamina propria
- Epithelium
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