GENERAL HISTOLOGY

Detailed explanation-1: -The absorptive surface area of the small intestine is increased by plicae circulares, villi, and microvilli.

Detailed explanation-2: -On the surface of each columnar cell there are about 600 very fine projections called microvilli that further increase the absorptive area of each villus. Villi of the intestine move in swaying, contracting motions. These movements are believed to increase the flow of blood and lymph and to enhance absorption.

Detailed explanation-3: -The small intestine is about 20 feet long and is divided into three sections called duodenum, ileum, and jejunum. The combination of circular mucosal folds, villi, and microvilli allows the small intestine to digest and absorb nutrients properly.

Detailed explanation-4: -Microvilli: The cells on the villi are packed full of tiny hairlike structures called microvilli. This helps increase the surface of each individual cell, meaning that each cell can absorb more nutrients.

Detailed explanation-5: -Villi and microvilli increase the surface area of the small intestine, which increases the absorption of nutrients by diffusion. Villi and microvilli form the inner layer of epithelial tissue in the small intestine and increase the absorption of nutrients from chyme.