What is the function of the small intestine in digestion?

The function of the small intestine in digestion primarily revolves around the absorption of nutrients from food. This tubular organ, which is approximately 20 feet long in adults, is where the majority of digestion and nutrient absorption occurs.

As food enters the small intestine from the stomach, it is mixed with digestive juices that contain enzymes produced by the pancreas and bile from the liver. These juices break down the food components into their smallest forms, such as amino acids, fatty acids, and simple sugars. The walls of the small intestine are lined with tiny, finger-like projections called villi, which increase the surface area for absorption. Through these villi, the digested nutrients are transferred into the bloodstream and subsequently transported throughout the body to be utilized for energy, growth, and cellular repair.

Thus, the primary role of the small intestine is to ensure that essential nutrients are efficiently absorbed so that they can support various bodily functions, making the correct answer focused on nutrient absorption.