The Digestive System

1. The Digestive System By: Summer Stussy

2. The Digestive System The Digestive system is built of a series of hollow organs that extend from the mouth to the anus. Food and waste travel from organ to organ in a wavy muscle contraction called peristalsis.

3. Interactions with other Systems • Nervous and Muscular- The brain sends impulses to the muscles to do appropriate actions. • Circulatory- The absorption of nutrients to the Circulatory System allows body cells to get nutrients. • Endocrine- Digestive juices contain enzymes.

4. Organs and Functions • Stomach- Stores food for hours at a time and breaking down food by having the walls churn. • Small intestine- The area where the digestion is completed. • Large intestine-(colon) It carries the undigested food out of the body. • Esophagus- A muscular tube that carries food from the mouth. • Rectum- Stores waste until it is ready to leave the body. • Liver- produces chemicals that are absorbed by other organs that are involved in the digestive tract. • Mouth- Breaks down food with saliva. • Anus- The end of the digestive tract that waste exits. • Gallbladder- Stores the livers chemicals until other organs are n need of it.

5. Steps of Digestion • First food enters the mouth and is broken down into small particles by saliva. • Next, the particles enter a muscular tube called the esophagus. It is transported down the esophagus to the stomach by the contracting of muscles called peristalsis. • When it reaches the stomach it stays there for about three hours. It is then churned and pounded with digestive fluids called bile. When it is ready to leave the stomach it is made into a thick liquid called chyme. • After that, it enters the small intestines where the digestion process is ending and the food is still being packed into smaller pieces. • Finally it enters the large intestine and is sent to the anus where the waste stays until the rectum is full. Then it is ready to exit the body.

6. Facts! • An adults digestive tract is about 30 feet long! • Our saliva glands produce about 2 liters of spit everyday. That’s an average of 50,000 liters of spit in a lifetime! • An average male eats about 50 tons of food in his lifetime! • The liver is the largest body gland. It also has the nickname of the “storage tank.”

7. Pictures!

8. Sources • https://sites.google.com/site/digestivesystem305/funfacts-2 • http://digestive.nidd.nih.gov/ddiseases/pubs/yrdd/ • http://kidshealth.org/parent/general/body_basics/digestive.html# • http://wiki.answers.com/Q/what_other_systems_does_the_digestive_system_work_with • http://library.thinkquest.org/07aug/0168/funfacts.html