1. THE DIGESTIVE SYSTEM

2. FUNCTIONS OF THE DIGESTIVE SYSTEM
Break down food
Absorption
Eliminate wastes

3. DIGESTION BEGINS Moisten food and begin chemical breakdown
epiglottis
esophagus
Salivary glands
Trachea
Moisten food and begin chemical breakdown
Long muscular tube that connects mouth and stomach
A flap of skin that seals off windpipe
stomach
Breaks down food with muscles and digestive juices

4. Peristalsis – involuntary waves of muscle contractions that move food through the digestive system

5. FINAL DIGESTION AND ABSORPTION
LIVER
-Breaks down medicines
-Gets rid of nitrogen from body
-Produces bile which breaks up fat particles
PANCREAS
Produces enzymes that breaks down starches, proteins and fats
SMALL INTESTINE
Absorption of nutrients
LARGE INTESTINES
Water absorbed by body and “good” bacteria make Vitamin K

6. A CLOSER LOOK AT THE SMALL INTESTINES
VILLI:
Millions of tiny finger-shaped structures
Found on the inner surface of intestines.
Absorb nutrients through the blood vessels and carry to the rest of the body

7. A CLOSER LOOK AT THE LARGE INTESTINES
“Good” bacteria feed on material in the large intestines
As material moves through the large intestine, water is absorbed into bloodstream.
Remaining material is eliminated from the body through the rectum and anus.