Intestines

The intestines are part of the digestive system and are responsible for the absorption of nutrients from the food we eat. 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 nutrient absorption takes place. It is divided into three parts: the duodenum, the jejunum, and the ileum. The inner lining of the small intestine is covered with tiny finger-like projections called villi, which increase the surface area for absorption.

Large Intestine

The large intestine is responsible for absorbing water and electrolytes from the remaining indigestible food matter and forming it into feces. It is made up of the cecum, colon, and rectum. The bacteria in the large intestine also play a role in the fermentation of undigested food and the production of certain vitamins.

Study Guide

1. What are the two main sections of the intestines?
   • The small intestine and the large intestine.
2. Where does the majority of nutrient absorption take place?
   • In the small intestine.
3. What are the three parts of the small intestine?
   • The duodenum, the jejunum, and the ileum.
4. What are the main functions of the large intestine?
   • Absorbing water and electrolytes, forming feces, and fermenting undigested food.

Studying the intestines is important for understanding the process of digestion and how our bodies extract nutrients from the food we eat.