Multiple choice general knowledge science & technology What is the small module that line the inside of the small intestine called? Appendix Villi Peristalsis Intestinal lining Reveal answer Fill a bubble to check yourself B Correct answer Explanation Villi are finger-like projections that line the small intestine and dramatically increase its surface area for nutrient absorption. The appendix is a vestigial organ, peristalsis is the muscular movement, and 'intestinal lining' is too generic.