Small Intestine: Anatomy & Role in Nutrient Absorption

The terms “small bowel” and “small intestine” are synonymous. This 6–7 m (20–23 ft) tubular organ connects the stomach to the large intestine and is the primary site of nutrient absorption. Its massive surface area—created by circular folds (plica circulares), finger-like villi, and microscopic microvilli—allows efficient uptake of carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream.