The small intestine receives secretions from [[1]] and [[2]].

The small intestine receives secretions from the liver and pancreas.

The secretions from the liver and pancreas which are delivered to the small intestine, play an important role in digestion. The liver produces bile, which aids in fat breakdown, and the pancreas produces digestive enzymes and bicarbonate, which aid in carbohydrate, protein, and fat breakdown.

The bile duct and pancreatic duct secretions are delivered to the small intestine and mixed with partially digested food, which is then subjected to chemical and mechanical digestion to prepare it for absorption into the bloodstream.

The walls of the small intestine are lined with finger-like projections known as villi and microvilli, which increase the surface area available for nutrient absorption.

The small intestine is the primary site of nutrient absorption in the body, and nutrients that are absorbed are transported to the liver and other tissues for further processing and utilization.