2. By Maya Cromwell, Robert Newman, Sean Bradley, Zahra Syed

3. chemical speeds up rate of chemical reactions Ex: pepsin Found in stomach Ex 2: salivary amylase Found in mouth Amazing Fact Time! Each of your seventy five trillion cells is incredibly producing two thousand proteins each second

4.  Takes place when food mixes while chewing and mixed in our stomach. Chemical digestion  Breaks down large molecules of food into different smaller molecules can absorb Amazing Facts Time! We eat about 500 kilograms of food per year

5.  nutrients enter the bloodstream and are circulated into the body’s cells  villi are covered with tiny, nutrient absorbing cells that pass nutrients into the bloodstream. Amazing Facts Time! It takes your mouth, esophagus, stomach, small intestine, large intestine, gallbladder, pancreas and liver just to digest a glass of milk.

6. Where it all begins Chemical digestion salivary amylase (saliva) Mechanical digestion Teeth Amazing Facts Time! 1.7 liters of saliva is produced each day by the mouth

7.  Long tube connected to stomach  Peristalsis  Tube of toothpaste Amazing Fact Time! Muscles contract in waves to move the food down the esophagus. This means that food would get to a person's stomach, even if they were standing on their head

8.  Sac like digestive organ  Md  Churns food with muscular contractions  Cd  Digestive acids break down the food  Mucus Amazing Fact Time! Within 2-6 hours, all food is emptied into the small intestine

9. Small intestine is a muscular tube that is about 2.5 cm in diameter If you were to stretch it out, it would be about 6 m The villi is located on the inside walls of the small intestine. The duodenum is first part of the small intestine Amazing Fact Time! The small intestine is 19.7 to 23 feet long

10. In the duodenum chemical digestion of  Proteins  Carbohydrates  Nucleic acids  Fat Amazing Facts Time! An adult’s stomach can hold approximately 1.5 liters of material

11.  Large intestine is larger in diameter than the small intestine  It is 1.5 m long and 7.5 cm in diameter  It surrounds the small intestine Amazing Facts Time! the large intestine is approximately 5 - 8 feet in length

12.  In first part of emulsification, (total destruction), liver creates bile, then stores it in the gallbladder  The gallbladder squeezes out the bile into the small intestine where it breaks down food. http://www.youtube.com/watch?v=j7GJcKuVGm8&feature=related Amazing Facts Time! After you eat, it takes usually between 24 and 72 hours in healthy adults for the complete process of digestion to occur

13.  The liver is to the left of the stomach  It is about the size of a size 3 shoe Amazing Facts Time! The liver performs over 500 functions

14.  Breaks down toxins like bile  Absorbs nutrients like a sponge with water Amazing Facts Time! Your liver can regenerate (re-build) itself. Even if only 25% of it is still healthy your liver can regenerate itself into a full liver again

15.  Is behind the stomach  Has enzymes and bicarbonate Amazing Facts Time! There are approximately 9,000 taste buds on the tongue

16.  Enzymes break down carbohydrates through chemical digestion  Bicarbonate helps neutralize stomach acid Amazing Facts Time! In an average person, it takes 8 seconds for food to travel down the food pipe, 3-5 hours in small intestine and 3-4 days in the large intestine

17.  Stores, compacts and eliminates indigestible material from the body  Enters large intestine as a soupy mixture  Absorbs most of the water in the mixture and changes liquid into semisolid waste called feces or stool  Whole grain, fruits, and vegetables, contain a carbohydrate called cellulose (which humans cannot digest)  Bacteria help because they feed on cellulose

18.  The digestive system completes 2 life processes: 1. Getting and Using Energy 2. Getting rid of wastes Amazing Facts Time! Every day 11.5 liters of digested food, liquids and digestive juices flow through the digestive system, but only 100 mls is lost in feces

19.  Gets and uses energy by taking in and storing nutrients  Gets rid of waste by breaking down food and getting rid of it through the anus Amazing Facts Time! Your liver consists of 96% water. (The water is inside the cells and in blood)

20.  burton.k12.ca.us  villagemeadows.dvusd.org  tutorvista.com

21. Amazing Fact Time! The surface area of the digestive system is approximately equal to that of a singles tennis court