Question

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

A. Microvilli

B. Long length

C. Rugae

D. Villi

E. Circular folds

Answer 1

Answer -Rugae

Rugae are a series of ridges which are produced when the walls of organ is folded .Most commonly rugae commonly mean the gastric rugae of the internal surface of the stomach.

The purpose of the gastric rugae is to distend the stomach for expansion of the stomach after the consumption of foods and liquids.When relaxed rugae appear when distended rugae disappear.

For small intestine

1)The circular folds slow down the passage of the partly digested food along the intestines, which ultimately result in increased surface for absorption. SMALL INTESTINE are made up of epithelium which are covered with small finger-like projections called villi . Each villus, in turn, is covered with microvilli.

2)Also long length increases the surface area and helps in Absorption .