1. Science Starter
What is the order that food passes through the digestive organs?
What is the role of the small intestine in the body?
In Earth Science, what is the difference between chemical and mechanical weathering?

2. Today’s Agenda Science Starter Digestion Notes
Enzymes & Digestion Article
Accessory Organs
Exit Quiz

3. The Digestive System
Unit 7

4. 15.1: Overview
Functions: mechanical and chemical breakdown of food
       *absorption of nutrients
Consists of alimentary canal and accessory organs

5. Wall of the Alimentary Canal

6. Mixing Movements
Contractions mix food with digestive juices
Peristalsis - pushes food down the tube

7. 15.2 Digestive System Organs
esophagus
2.  liver
3.  stomach
4. pyloric sphincter
5.  duodenum
6.  pancreas
7.  jejunum
8.  ileum
9.  cecum
10. appendix
11.  ascending colon
12.  descending colon
14.  anus

8. Esophagus Esophageal hiatus is where it penetrates the diaphragm
Lower Esophageal sphincter at entrance to stomach

9. Stomach

10. Stomach
Gastric Juices contain acids that break down food  - secreted by gastric glands
PEPSIN  - most important digestive enzyme for breaking down food
Mucus prevents stomach from digesting itself

11. Chyme - paste, after food has been broken down, released then into the duodenum via the pyloric sphincter valve

12. PANCREAS
Secretes insulin which breaks down sugars
Pancreatic Juice also breaks down fat

13.  Liver
 1 large right lobe  | 1 smaller left lobe

14. Liver Functions 1. Blood glucose levels
2.  Breakdown of lipids and fats
3.  Protein metabolism
4.  Stores vitamins
5.  Destroys damaged RBCs
6.  Removes toxins
7.  Secretes bile

15. Gall Bladder - under liver
cystic duct --> common bile duct, stores bile, digests fat
                 *gallstones may form

17. Small Intestine 1. Duodenum 2. Jejunum 3. Ileum
Starts at the pyloric sphincter
1.  Duodenum
2.  Jejunum
3.  Ileum

18. Intestinal villi - increase surface area to absorb nutrients, connect to vessels

19. Small Intestine =
ABSORPTION

20. Large Intestine
Cecum 
Appendix
Colon (4 parts)
Rectum
Anus

21. Function of Large Intestine
The main job is 
WATER REABSORPTION...

23. *Read the article on digestion*
15.3 Types of Digestion
Mechanical- physically breaking the food into smaller pieces. Begins in the mouth (chewing)
Chemical- breaking down the food into simpler nutrients that can be used by the cells. Begins in the mouth when food mixes with saliva
*Read the article on digestion*

24. Accessory Organs & Organ System
Color the accessory organs and read about the pancreas, liver, and gallbladder
When you finish pick up a digestive system organ cut out.
Put the organs together, color them, and place them on a sheet of large paper sheet!

25. **Homework: Food Particle Story**
Exit Quiz
Where does mechanical digestion occur?
Where does chemical digestion occur?
What is the role of the pancreas in digestion?
List all of the accessory organs
**Homework: Food Particle Story**