THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -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: -The small intestine has three features which allow it to have such a huge absorptive surface area packed into a relatively small space: Mucosal folds: The inner surface of the small intestine is not flat, but thrown into circular folds.

Detailed explanation-3: -Plicae circulares slow the passage of the food along the intestine and increases the surface area of absorption.

Detailed explanation-4: -These folds, known as plicae circulares, are approximately 5 to 6 cm (2 inches) long and about 3 mm (0.1 inch) thick. Plicae circulares are present throughout the small intestine except in the first portion, or bulb, of the duodenum, which is usually flat and smooth, except for a…