In which organ does the majority of nutrient absorption occur?

The small intestine is the primary site for nutrient absorption in the digestive system. This organ is specifically adapted to maximize the absorption of the products of digestion, such as amino acids, glucose, fatty acids, and vitamins into the bloodstream. Its interior is lined with tiny hair-like structures called villi, which increase the surface area available for absorption, and microvilli that further enhance this area.

Enzymes produced in the pancreas and bile from the liver help to break down food into smaller molecules that can be absorbed effectively. The small intestine is divided into three parts: the duodenum, jejunum, and ileum, with the majority of absorption occurring in the jejunum and ileum.

In contrast, while the stomach plays a role in digestion and some limited absorption of certain substances (such as alcohol), it does not absorb the vast majority of nutrients. The large intestine's primary function is to absorb water and electrolytes, along with the formation and storage of feces, but it is not involved in nutrient absorption to the extent of the small intestine. The liver does not absorb nutrients; instead, it processes and metabolizes nutrients that have already been absorbed from the small intestine, playing a critical role in regulating blood nutrient levels and detox