What is the most important part of digestive system?

The most important part of the digestive system is the small intestine. The small intestine is a long, coiled tube that runs from the stomach to the large intestine. It is where most of the digestion and absorption of nutrients takes place. The small intestine is lined with tiny villi, which are finger-like projections that help to increase the surface area for absorption. The small intestine also secretes enzymes that break down carbohydrates, proteins, and fats into smaller molecules that can be absorbed. The small intestine is also responsible for the absorption of water and electrolytes.