Small Intestine

The small intestine is a vital organ in the digestive system responsible for the further breakdown and absorption of nutrients from food.

Anatomy of the Small Intestine

The small intestine is divided into three parts: the duodenum, jejunum, and ileum. The duodenum is the first section and is responsible for receiving partially digested food from the stomach. The jejunum and ileum are the subsequent sections where most of the nutrient absorption takes place.

Functions of the Small Intestine

• Digestion: The small intestine plays a crucial role in further breaking down food using enzymes secreted by the pancreas and bile from the liver.
• Nutrient Absorption: It absorbs nutrients, such as sugars, amino acids, and fatty acids, into the bloodstream to be utilized by the body.
• Immune Function: The small intestine contains specialized immune cells that protect against harmful bacteria and toxins.

Study Guide

Here are some key points to remember when studying the small intestine:

1. Identify the three parts of the small intestine and their respective functions.
2. Understand the role of enzymes and bile in the digestion and absorption processes.
3. Describe the importance of nutrient absorption in the small intestine for overall health.
4. Explain the relationship between the small intestine and the immune system.