alleryStart learning →Which three features of the small intestine wall enlarge its absorptive surface?
ARugae, haustra, and teniae coli
BGastric pits, glands, and crypts
CAnal columns, sinuses, and valves
DCircular folds, villi, and microvilli
Answer & Solution
Correct answer: D. Circular folds, villi, and microvilli
1. The small intestine has the same four wall layers as the rest of the canal, with three extra features.
2. Circular folds, villi and microvilli together raise the absorptive surface area more than 600-fold.
3. Rugae belong to the stomach, and haustra and teniae coli belong to the large intestine.
4. Anal columns and anal sinuses are folds and recesses of the anal canal, far from the absorptive region.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 23 "The Digestive System", section 23.5 The Small and Large Intestines_
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