digestive system by: jamie casselman. what is the digestive system? a complex group of organs and...
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DIGESTIVE SYSTEMBy: Jamie Casselman
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The Digestive System
What is the digestive system?
• A complex group of organs and glands that process the food we eat
http://www.caribexams.org/files/files/digestive_system.gif
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• It mechanically and chemically breakdowns food into smaller molecules which can be absorbed into the blood stream
• Excretes waste materials your body can’t use
What does it do?
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1. Ingestion
2. Digestion
3. Absorption
4. Elimination
Four Stages of Digestion
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• Process of putting food or drink into your mouth
Ingestionhttp://lerablog.org/wp-content/uploads/2013/07/bad-eating-habbit.jpg
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DigestionMechanical: Begins in the mouth with the
teeth and tongue chewing food into pieces you can swallow
Chemical: Salivary glands produce
enzymes (amylase), which breaks down complex carbohydrates to simple ones
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Path of DigestionMouth
Teeth, tongue Salivary glands – Excrete enzymes
Swallow
Pharynx – epiglottis covers trachea when you swallow
Esophagus
Stomach – churns the food and mixes with gastric juice to form chyme
Peristalsis
Small intestine – duodenum – breaks down fat with bile from liver – enzymes from pancreas break down chyme
Pancreas Liver
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AbsorptionSmall intestine: occurs in the last five meters
of called the jejunum and ileum
villi increase the rate of absorption of nutrients
Large intestine: Accepts what the small
intestine doesn’t absorb Absorbs more water and
concentrates the wastes
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Undigested materials (feces) from the large intestine pass into the rectum and are eliminated through the anus
Eliminationhttp://www.almightydad.com/wp-content/uploads/2009/06/baby-in-toilet.jpg
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Bibliography
“Digestive system.” Innerbody.com. 15 September 2013.<http://www.innerbody.com/image/digeov.html>.
“Human digestive system.” Enchanted learning.com. 20 September 2013.
<http://www.enchantedlearning.com/subjects/anatomy/digestive.html>.
McGraw-Hill Ryerson., 2006. BC Science 8. Ontario: McGraw-Hill Ryerson Limited, 2006.
Parker, Nancy Winslow. Organs. New York: Greenwillow Books, 2009.