The Digestive System!

1. The Digestive System! What's in your stomach? By: Aleah Fisher & Brianna Hay

2. Standard 9f • Students Know the individual functions and sites of secretion of digestive enzymes

3. The Mouth • The mouth is the first step to the digestive system • The saliva in your mouth contains a digestive enzyme called amylase • Amylase breaks down starches in your food

4. The Esophagus • After you chew your food your tongue helps to push it to the back of your throat, and down your esophagus • The esophagus is a muscular tube that connects your mouth to your stomach • Your food moves down by your peristalsis, • Peristalsis are a series of smooth muscle contractions

5. The Stomach • Once your chewed up food reaches the end of your esophagus it enters the stomach • Physical and chemical digestion take place (muscular churning and chemical digestion) • There are three layers of muscles that lay on top of each other, that are located on the walls of your stomach. • When these muscles contract they try to break down the swallowed food, this process being muscular churning. • The chemical digestion begins next as the gastric juice located in the lining of the stomach, this contains pepsin which begins the digestion of food.

6. The Small Intestine • After digested your food moves to the small intestine, a muscular tube about six inches long • The digestion of food is completed here by further muscle contractions, at the same time carbohydrates and protein under go more chemical digestion with the help of produced enzymes secreted by the pancreas

7. The pancreas • The pancreas is a soft, flattened gland the secret digestive enzymes as well as hormones • The mixture of enzyme sit creates breaks down carbohydrates, proteins, and fats • Alkaline pancreatic juice also helps to neutralize the acidity of liquid food stopping any continuing pepsin actions

8. The liver and gallbladder • The liver is another key component to the digestive system with many functions • One of its functions is to produce bile, which is a chemical substance that breaks down fats • Once bile is made in the liver it is stored in a small organ called the gallbladder

9. The large intestine • What's left of your meal finally makes its way down to the large intestine large intestine is a muscular tube also known as the colon • Coming off of the large intestine is the appendix which serves no purpose in the digestive system

10. Water Absorption and elimination of waste • As the mixture passes through the large intestine water and salt are absorbed by the intestinal walls leaving behind more solid materials • After 18 to 24 hours in the large intestine the left over indigestible material is now considered a feces

11. The Rectum • The rectum is the last part of the digestive system • The feces are eliminated from the rectum through the anus • Your meals entire journey takes from 24 to 33 hours