Download 19.2 Notes The Digestive System -What is it? The system that breaks

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Science Notes
5/28/2010 11:37:00 AM
19.2 Notes
The Digestive System
-What is it?
 The system that breaks down food so that it can be used by the
body

-Why is it important?
 Changes foods into nutrients
 Absorbs and transports nutrients
 Removes food waste from body

-Digestive system failures
 Loss of teeth
 Scleroderma of the esophagus
 Stomach cancer
 Gallstones
 Pancreatic cancer
 Colon Cancer

- Some




fun facts
Begins in mouth
Ends in small intestine
Enzymes in the digestion system
Made up of digestive track
VocabularyDigestion- Processing of food in the body
Enzyme- Protein controlling biochemical reactions
Mechanical Digestion- The actual physical break down of food into smaller
pieces
Chemical Digestion- The act or process of converting food into chemical
substances that can be absorbed
Saliva- The clear liquid secreted into the mouth by the salivary glands,
consisting of water, mucin, protein, and enzymes
Peristalis- a series of organized muscle contractions that occur throughout
the digestive tract
Chyme- that partially digested mass of food that is forced into the small
intestine
Villi- tiny, finger-like projections that come out from the wall of the small
intestine
Quiz Questions
1.Compare mechanical and chemical digestion.
2.Where does most digestion occur?
3.What product is made by bacteria in the large intestine?
4.What continues to force the remaining materials that have bean digested?
5/28/2010 11:37:00 AM
5/28/2010 11:37:00 AM