Question at position 8 In which portion of the GI tract are the circular folds located?large intestinesmall intestinestomachesophagus单项选择题
A
large intestine
B
small intestine
C
stomach
D
esophagus

Question

Question at position 8 In which portion of the GI tract are the circular folds located?large intestinesmall intestinestomachesophagus

BlackTom AI · Accepted Answer

Circular folds (plicae circulares, or valves of Kerckring) are permanent, transverse mucosal and submucosal ridges found in the small intestine. They increase the internal surface area and cause chyme to spiral, slowing passage and promoting more efficient nutrient absorption.

Relevant knowledge points:
- Plicae circulares are characteristic of the small intestine (most prominent in the jejunum, present in the duodenum and diminishing in the ileum).
- The stomach has rugae (folds of mucosa that flatten when the stomach distends) — these are not the same as the permanent circular folds.
- The large intestine lacks plicae circulares; its external/internal features include taeniae coli and haustra, and its mucosa does not form those permanent transverse ridges.
- The esophagus has longitudinal mucosal folds that accommodate distension during swallowing, not circular transverse folds.

Step-by-step reasoning:
1. Identify the structure named: “circular folds” refers to plicae circulares (permanent transverse ridges).
2. Recall anatomical distribution: plicae circulares occur throughout the small intestine with greatest density in the jejunum and tapering off toward the ileum.
3. Compare to other organs listed:
   - Large intestine: no circular folds; has haustra and teniae coli → incorrect.
   - Stomach: has rugae, which are temporary and associated with expansion → incorrect.
   - Esophagus: has longitudinal folds for distension during swallowing → incorrect.
4. Therefore the only correct location among the options is the small intestine.

Why the correct answer is correct:
Plicae circulares are unique, permanent transverse folds of mucosa/submucosa designed to increase absorptive efficiency of the small intestine; none of the other listed GI regions have this specific structure.

Why the other options are incorrect:
- Large intestine: features haustra, not plicae circulares.
- Stomach: features rugae that disappear with distension.
- Esophagus: has longitudinal folds, not circular, permanent transverse ridges.

Conclusion: The correct answer is small intestine, which matches the provided answer.

Question at position 8 In which portion of the GI tract are the circular folds located?large intestinesmall intestinestomachesophagus单项选择题

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