2. Digestive System
Chapter 39-2
yes
That’s wrong
nope

3. Mouth Function Mechanical Digestion – breakup of food
Beginning of Chemical Digestion
Saliva from Salivary Gland

4. Esophagus
Function
Rhythmic contraction of muscle rings in wall push food to the stomach (Peristalsis)

5. Stomach Function Food mixes together and becomes Chyme
A mixture of food and chemicals
Chemical Digestion (Acid and other chemicals break down food)

6. Small Intestine Function Most nutrient absorption takes place here!
Enzymes that work in the small intestine also come from the pancreas and liver.
Basic environment (not acid, base) helps neutralize acid from stomach.
As chyme enters the duodenum:
Carbohydrates and proteins are only partially digested
No fat digestion has taken place

7. Liver Function Secretes Bile into beginning of small intestine
Helps to break down fats by preventing their sticking together
Not an Enzyme!
Works like dish-washing soap
The Gall Bladder stores the bile

8. Chemical Digestion: Fats
Like soaping your body!
Or the dishes!
Figure 23.35

9. Pancreas Function Secretes Sodium Bicarbonate
base that neutralizes acid in small intestine
Many chemicals used in digestion come from the pancreas
Hidden behind stomach

10. Large Intestine (Colon)
Function
Removes water from undigested material
What happens when not enough water is removed?
Some bacteria live here
Breakdown indigestible carbohydrates (lactose)
Release irritating acids and gases (flatus)
Synthesize B complex vitamins and vitamin K