1. The Digestive System Section 38-2 Organs and their functions
The action of insulin and glucagon

2. Can you name some parts of the digestive system?

3. Label the diagram… Common bile duct Esophagus Duodenum Liver
Salivary gland
Tongue
Trachea
Appendix
Gall bladder
Esophagus
Liver
Stomach
Pancreas
Colon
Rectum
Anus
Pancreatic duct

5. Parts Mouth Esophagus Stomach Small Intestine Large Intestine Rectum
tongue
teeth
salivary glands
Esophagus
Peristalsis
Stomach
Small Intestine
Liver (bile)
Pancreas
Gall Bladder
Large Intestine
Rectum

6. Mouth Mechanical Teeth (28-32) Tongue (taste) Chemical
incisors (cutting)
cuspids
bicuspids
molars (grind)
Tongue (taste)
Chemical
Salivary Glands (3)
starch digestion (amylases)
lubricates food
allows speech
lysozyme (antibacterial)

7. Pharynx Common chamber for the …..
Digestive system (food into the esophagus)
Respiratory system (air into the trachea)
Epiglottis
(LT side Two - Chapter 11)

8. Esophagus Peristalsis Peristalsis continues further down….
the contraction of smooth muscles: this forces food (a bolus) forward
involuntary muscles
Peristalsis continues further down….

10. Stomach Mechanical churns mixes stores food! Chyme is what results
(partially digested food in the stomach)
Chemical
only protein(pepsin)
Gastric Glands(3)
pepsinogen
acid(HCl, antibacterial)
mucus

11. Sphincters - valves
Cardiac sphincter
pyloric sphincter

12. Diagram Back to diagram… valves Gall bladder liver pancreas
Does food pass through the liver, gall bladder, pancreas, duodenum?
Duodenum

13. Small Intestine Role of liver Role of gall bladder Role of pancreas
Does food actually pass through these organs?
3 sections: 1st called duodenum

16. Liver Makes Bile emulsifies fat not digestion not an enzyme
it is the breaking of fat into droplets

17. Gall Bladder
Stores bile

18. Pancreas Two roles: hormones and digestive enzymes
Digestive enzymes act on all food groups...
fat
protein
carbohydrate
nucleic acids
Hormones will be discussed later.

19. Small Intestine (cont.)
Cells in the walls secrete more enzymes
villi and microvilli
increased surface area
with capillaries (sugars, amino acids)
with lymph vessels (lacteals) (fatty acids)
What is the relationship between the cell and microvilli?
Microvilli are on the membrane of the cells of the small intestine.

22. Large Intestine
Reabsorption of water
Bacteria
produce B-vitamins

23. Rectum
Storage and elimination of solid waste
THE END…….

24. Credits Mary Wang ‘03 - typist, stomach diagram
Mr. Nelson - editing, content