1. Digestive System
Chapter 14

2. Digestive overview
primary function is digestion of food & absorption of nutrients

4. Anatomy of GI tract
the walls of the tract composed of 4 layers of tissue
1. mucosa
2. submucosa

5. Anatomy of GI tract
3. muscularis

6. Anatomy of GI tract
4. serosa

7. Anatomy of GI tract

8. Muscularis of stomach

9. Movement of GI tract
peristalsis
segmentation

10. peristalsis
segmentation

11. Digestion is a 4 part process
Ingestion
Digestion
Absorption
Elimination

12. Ingestion
food is taken into body by mouth

13. Digestion
physical & chemical breakdown of food into absorbable molecules
stomach
small intestine
pancreas
liver

14. Indigestion/heartburn

15. Absorption
mostly occurs in small intestine
villi,
microvilli

16. Small intestine

17. What causes gas & the toots?

18. Elimination
Elimination: indigestibles are discarded as waste products

19. A few words about poop
Composition, on average is about . . .

20. Obesity (epidemic??)

21. Obesity, continued
Hormone leptin

22. Health effects of obesity
Body has a harder time maintaining homeostasis & some effects are: