Intestines

The intestines are a part of the digestive system and are responsible for the absorption of nutrients from food. There are two main sections of the intestines: the small intestine and the large intestine.

Small Intestine

The small intestine is where the majority of digestion and nutrient absorption occurs. It is divided into three parts: the duodenum, the jejunum, and the ileum. The walls of the small intestine are lined with tiny finger-like projections called villi, which increase the surface area for absorption.

Functions of the Small Intestine:

• Continued digestion of food from the stomach
• Absorption of nutrients, such as carbohydrates, proteins, and fats
• Transport of nutrients into the bloodstream

Large Intestine

The large intestine, also known as the colon, is wider than the small intestine but shorter in length. It absorbs water and electrolytes from the undigested food matter and forms feces for elimination.

Functions of the Large Intestine:

• Reabsorption of water and electrolytes from undigested food
• Formation and storage of feces
• Elimination of waste from the body

Study Guide

Here are some key points to remember about the intestines:

1. The small intestine is where the majority of digestion and nutrient absorption occurs.
2. The walls of the small intestine are lined with villi to increase the surface area for absorption.
3. The large intestine absorbs water and electrolytes from undigested food and forms feces for elimination.
4. Both the small and large intestines play crucial roles in the digestive process and nutrient absorption.

Understanding the structure and functions of the intestines is essential for comprehending the digestive system as a whole.