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The Small and Large Intestines Essential components of the digestive system **Please take notes in your notebook** The Small Intestine The Small Intestine Found between the stomach and large intestine Average length is 21-25 feet long Divided (by function) into three sections: Duodenum Jejunum Ileum What is the main job of the Small Intestine? Job of the small intestine: Absorbs and transfers digested food particles into the blood stream Digested food particles must be transported throughout the body to reach all cells This means that nutrients travel from the digestive system to the circulatory system Small Intestines contain VILLI The small intestines contain villi Villi Small finger-like projections in the lining of the intestine Increase the surface area of the small intestine, allowing for more absorption of food The small intestine, if stretched out, would cover the area of a tennis court! Images of villi Movement of food from the small intestine the blood Nutrients from the digested food move from the inside of the small intestine, through the walls of the villi, and into the bloodstream. Once in the blood, food particles travel all over the body to cells that need these small molecules as building blocks. The Large Intestine The Large Intestine (aka: Colon) Found between the small intestine and rectum Approximately 4-5 feet long Divided into four sections: Ascending Transverse Descending Sigmoid What is the main job of the Large Intestine? The main job of the large intestine: To remove water from digested food (reabsorb water back into the body). It’s like a sponge for water! Any food particles that haven’t been absorbed pass through the large intestine and become solid waste (feces). The reabsorbed water will be filtered by the kidneys and excreted as liquid waste.
