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Q: The innermost layer lining the lumen of the alimentary canal is the :
  • A. Muscularis
  • B. Mucosa
  • C. Serosa
  • D. Lumen
Correct Answer: Option B - The mucosa, composed of simple epithelium cells, is the innermost layer of the gastrointestinal (GI) tract. GI tract is composed of four layers. Each layer has different tissues and functions, from the inside out they are called mucosa, submucosa, muscularis and serosa. The mucosa contains specialised goblet cells that secrete sticky mucus throughout the GI tract.
B. The mucosa, composed of simple epithelium cells, is the innermost layer of the gastrointestinal (GI) tract. GI tract is composed of four layers. Each layer has different tissues and functions, from the inside out they are called mucosa, submucosa, muscularis and serosa. The mucosa contains specialised goblet cells that secrete sticky mucus throughout the GI tract.

Explanations:

The mucosa, composed of simple epithelium cells, is the innermost layer of the gastrointestinal (GI) tract. GI tract is composed of four layers. Each layer has different tissues and functions, from the inside out they are called mucosa, submucosa, muscularis and serosa. The mucosa contains specialised goblet cells that secrete sticky mucus throughout the GI tract.