Small intestine

Definition

The small intestine is a long, coiled tube in the digestive system where most of the digestion and absorption of nutrients takes place. It connects the stomach to the large intestine and is divided into three parts: the duodenum, jejunum, and ileum.

Related terms

Absorption:

The process by which nutrients from digested food are taken up into the bloodstream from the intestine.

Digestive Enzymes: Proteins secreted by the digestive tract that catalyze reactions to break down food substances into simpler forms.

Villi:

Small, finger-like projections that line the inner wall of the small intestine, increasing its surface area for more efficient nutrient absorption