1. The Components of the Digestive System
Figure 24.1

2. Functions of the digestive system
Digestion
Secretion
Absorption
Excretion

3. Mouth teeth – grind food (mechanical digestion)
saliva – amylase breaks down simple carbohydrates (chemical digestion)

4. The pharynx Common passageway for food, liquids, and air
Epiglottis – prevents food from going to the lungs

5. Esophagus
Peristalsis
– muscular contractions that moves food along

6. The Swallowing Process video

7. Stomach storage space for food – approximately 2 liters
gastric juices – pepsin breaks down proteins
mucus layer- prevents stomach from digesting itself (ulcer)
no absorption of nutrients
Over 50 different sphincters in the human body

8. Figure The Stomach
Figure 24.12b

9. Lining

10. The Stomach Lining
Figure 24.13c, d

11. Small intestine duodenum – harsh digestion
jejunum – small molecules are absorbed
ileum – most absorption takes place here

12. Regions of the Small Intestine

13. The Structure of the Intestine
Figure 24.3

14. The Intestinal Wall – if flattened would be as big as tennis court
Figure 24.17b, c

15. Figure 24.17 The Intestinal Wall

16. Large intestine Reabsorb water and compact material into feces
Absorb vitamins produced by bacteria (ecoli)
Store fecal matter prior to defecation
appendix – vestigial organ; no function

17. Figure 24.23 The Large Intestine
Figure 24.23a

18. The pancreas strong pancreatic juices neutralizes acids from stomach
insulin – regulates blood sugar

19. Figure The Pancreas

20. Liver bile – breaks down lipids recycles red blood cells
detoxifies chemicals

23. Gallbladder
a. stores bile

24. Figure 24.21 The Gallbladder

25. DigestionVideo clips – you tube
Time for timer – you are what u eat (1:01)
 Line rider – ride though the digestive system with digestion blues song (2:29)
Molly marshmallow video (10 minutes)

27. URINARY (excretory) SYSTEM Chapter 38

28. Homeostasis = chemical balance Excretion - Eliminating harmful molecules from the blood such as: urea, salt, glucose, amino acids, water, vitamins and minerals.

29. Anatomy of the
Urinary System

31. Kidney (2)
Ureter (2)
Bladder (1)
Urethra (1) Cloaca in the frog