Home › SMLE (Saudi Medical Licensing) › Anatomy & Physiology › The Digestive System › Which three features of the small intestine wall…
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_
Related questions
About how much of the water reaching the small intestine is absorbed there?Vitamin B12 binds intrinsic factor. Where is the resulting complex taken up, and by what mGlucose and galactose enter intestinal cells by co-transport with sodium. How does fructosBy which route do chylomicrons reach the bloodstream after leaving an intestinal epitheliaWhat does pancreatic lipase leave behind after acting on one triglyceride?Lactase acts on lactose. Which two monosaccharides does it release?Which three structures are the liver's three main components?Which component makes pancreatic juice slightly alkaline?