Biology Digestion/Nutrition MDCAT 2016
PMDC Verified Question 42 of 48
Digestive system consists of different layers, the innermost is known as:
A
Submucosa
B
Muscularis
C
Mucosa
D
Serosa
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Mucosa
Concept:

The wall of the gastrointestinal tract (alimentary canal) is structurally organized into four distinct histological layers from the outside in.

Formula:

N/A

Solution:

  • The outermost layer is the Serosa.
  • Moving inward, the next layer is the Muscularis (smooth muscle).
  • Inside that is the Submucosa (connective tissue and vessels).
  • The absolute innermost layer lining the lumen is the Mucosa, which contains the absorptive and secretory epithelial cells.


Why other options are incorrect:

Submucosa, muscularis, and serosa represent the middle and outer protective/motile layers, not the innermost absorptive lining.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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