Small Intestine
The complete digestion of food occurs in the small intestine.

Function of Small Intestine
- The small intestine is where the majority of chemical digestion and nutrient absorption takes place.
- Enzymes from the pancreas and bile from the liver help break down food particles into smaller molecules that can be absorbed by the body.

Process of Digestion in Small Intestine
- After food passes through the stomach, it enters the small intestine where further breakdown of proteins, carbohydrates, and fats occurs.
- Enzymes in the small intestine help break down these macromolecules into smaller units like amino acids, simple sugars, and fatty acids.
- Villi and microvilli in the small intestine increase the surface area available for absorption of these nutrients into the bloodstream.

Importance of Small Intestine
- The small intestine is crucial for the absorption of nutrients such as vitamins, minerals, and other essential substances that are needed for the body to function properly.
- The nutrients absorbed in the small intestine are then transported throughout the body to provide energy and support various physiological processes.
In conclusion, the small intestine plays a vital role in the complete digestion of food and the absorption of essential nutrients that are necessary for maintaining overall health and well-being.

The small intestine is the primary site for the complete digestion of food. Here, digestive enzymes break down carbohydrates, proteins, and fats into their absorbable units.