Transcript The Digestive System - science

The Digestive System
Mouth
• Mechanical digestion
- teeth
• Chemical digestion –
saliva
• 11 cm long
Esophagus
• Muscular tube
• Peristalsis
• About 25 cm long
Stomach
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Strong muscles
Digestive juices
Chyme
About 22 cm long
Small Intestine
• Most digestion occurs
here
• Molecules pass out
through villi into blood
• About 690 cm long
Pancreas
• Accessory organ
• Food does not go
through the pancreas
• Produces chemicals
to help break down
macromolecules
Liver
• Accessory organ
• Has many jobs
• Produces bile to help
digest fat
Gall Bladder
• Accessory organ
• Stores bile
• Helps digest fat
Large Intestine (Colon)
• Absorbs extra
nutrients & water
• Forms wastes into
solid feces
• About 152 cm long
Rectum
• Stores wastes
• About 14 cm long
Anus
• Muscle that controls
when wastes leaves
the body