5 Questions
Which layer of the alimentary canal is responsible for the production of mucus and acts as a lubricant for food passage?
Mucosa
Which of the following correctly describes the composition of the muscularis externa?
Circular layer and longitudinal layer
Which layer of the alimentary canal is primarily responsible for protecting the mucosa?
Submucosa
Which of the following is NOT a component of the mucosa?
Serosa
What is the primary function of the serosa?
Line the closed cavities of the body
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
Learn about the tissue composition and general function of each of the four layers of the alimentary canal, including the serosa, muscularis externa, submucosa, and mucosa. Understand the role of each layer in the digestive process.
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