THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Mucosal folds: The inner surface of the small intestine is not flat, but thrown into circular folds. This not only increases the surface area, but helps regulate the flow of digested food through your intestine.

Detailed explanation-2: -To ensure complete digestion and absorption of nutrients the area of contact between nutrients and intestinal surface is needed to be high enough. A large surface area is an important characteristic in an organ where absorption occurs so intensely.

Detailed explanation-3: -Scientists Lars Fändriks and Herbert Helander have used quantitative microscopic techniques to determine that the surface area of the gastro-intestinal tract in healthy adults is “only” between 30 and 40 square meters. By far the greatest part of this is the small intestine.

Detailed explanation-4: -This large surface area is due to the presence of many finger-like projections called villi .