ANATOMY

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: -The lining of the small intestinal mucosa is very highly specialized for maximizing digestion and absorption of nutrients. The lining is highly folded to form microscopic finger-like projections called villi which increase the surface area to help with absorption.

Detailed explanation-3: -The absorptive surface area of the small intestine is increased by plicae circulares, villi, and microvilli.

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

Detailed explanation-5: -The large intestine has 3 primary functions: absorbing water and electrolytes, producing and absorbing vitamins, and forming and propelling feces toward the rectum for elimination.