1. Digestive System

2. Purpose: Ingestion: Take food in Digestion: Break down food
Physically by chewing
Chemically through reactions
and acids
Absorption: Nutrients move
into the blood
Elimination: Waste passes
out of the system

3. ORGANS INVOLVED IN DIGESTION
Label your digestive system diagram with the following labels

4. Tissues
The entire digestive tract is lined with epithelial tissue that secretes mucus
Functions of mucus:
Protects tissue from digestive enzymes
Allows material to pass smoothly along tube

5. Did you know?
If you eat spoiled food, your body recognizes the presence of toxins and attempts to remove as quickly as possible. You experience this as vomiting or diarrhea.

6. Mouth Mechanical digestion Chemical digestion
Breaks food down by chewing
Chemical digestion
Enzymes in saliva break down molecules of food

7. Esophagus Muscular tube connecting mouth and stomach
Smooth muscle tissue: can contract with conscious thought

8. Stomach Mechanical Digestion Chemical Digestion
Stomach churns food
Chemical Digestion
Very strong acid (pH 2)
Digestive enzymes
Contains many nerves that tell us when we’re full

9. Did you know?
Heartburn occurs when stomach acid backs up into your esophagus
Your esophagus does not have the thick mucous layer that protects your stomach and this results in a burning sensation
Treatment can include taking an antacid to neutralize the acid

10. Small Intestine 6m long and 1.5 cm in diameter Site of most digestion
Goblet cells secrete mucous
Nutrients diffuse through the wall of the small intestine into the bloodstream

11. Large Intestine 1.5m long and 6cm in diameter
Absorbs water from indigestible food
Remaining solid matter is excreted as feces from the anus

12. Accessory Organs Liver Gallbladder Pancreas
Secretes bile which helps to emulsify fats
Gallbladder
Stores bile
Pancreas
Produces insulin which regulates the concentration of glucose in the blood