Question

Which of the following is NOT a structural modification of the small intestine that increases surface area?

villi
circular folds
microvilli
rugae

Answer 1

Rugae

Step-by-step explanation:

These are the inner folds of the stomach. The folds are pronounced in an empty stomach that is not yet distended by food. They also increase the surface area in which the food is in contact with digestive enzymes produced by the stomach walls.