1. The Digestive Process Begins

2. What are the three functions of the digestive system?

3. Functions of the Digestive System
Breaks down food into molecules the body can use
The molecules are absorbed in to the blood as nutrients and carried throughout the body
Wastes are eliminated from the body

4. Organs of the Digestive System

5. 2 Types of Digestion
Digestion- process by which body breaks down food into small nutrient molecules

6. 2 Types of Digestion Chemical Digestion Mechanical Digestion Mouth
Stomach
Small
Intestines
Stomach
Mouth

8. What happens in the mouth?

9. What happens in the mouth?
Digestion starts in the mouth
BOTH: mechanical and chemical digestion occur in the mouth
Mechanical digestion- chewing food using your teeth, saliva softens the food to make it easier to chew and swallow
Chemical digestion- saliva breaks down starch into sugars
Saliva is an enzyme called amylase

10. What happens in the mouth?

11. Esophagus

12. Esophagus

13. What happens in the esophagus?

14. What happens in the esophagus?
Esophagus- Muscular tube that connects mouth to stomach
After you swallow the food it travels to the stomach (in about 10 seconds)
Turn to p.521 and answer the following on your note guide:
Describe peristalsis.
Why do you think the esophagus is lined with mucus?
How does the epiglottis prevents food from entering your lungs?

15. Peristalsis
Occurs in esophagus, stomach, small & large intestines

17. What happens in the esophagus?

18. What happens to food in the stomach?
Turn to p.p and answer the questions on your note guide.
Do mechanical and/or chemical digestion occur in the stomach?
What are digestive juices?
Since digestive juices are so strong, why doesn’t it burn a hole in your stomach?

19. Inside the Stomach page 523

20. The Stomach

21. The Stomach

22. What happens to food in the stomach?

23. Stomach Ulcer

24. Review