GENERAL HISTOLOGY

Detailed explanation-1: -The small intestine is the site of terminal food digestion, nutrient absorption, and endocrine secretion. The lining of the small intestine consists of a series of permanent spiral or circular folds, termed the plicae circulares, which amplify the organ’s surface area, promoting efficient nutrient absorption.

Detailed explanation-2: -Plicae circulares slow the passage of the food along the intestine and increases the surface area of absorption.

Detailed explanation-3: -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-4: -The plicae circulares are most prominent in the distal duodenum and jejunum.