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Digestive system. By: Jamie Casselman. 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. What does it do?.

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digestive system

Digestive system

By: Jamie Casselman

the digestive system
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

what does it do
What does it do?

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

four stages of digestion
Four Stages of Digestion

Ingestion

Digestion

Absorption

Elimination

ingestion

http://lerablog.org/wp-content/uploads/2013/07/bad-eating-habbit.jpghttp://lerablog.org/wp-content/uploads/2013/07/bad-eating-habbit.jpg

Ingestion

Process of putting food or drink into your mouth

digestion
Digestion

Mechanical:

  • 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 Digestion

Mouth

Teeth, tongue

Salivary glands – Excrete enzymes

Swallow

Pharynx – epiglottis covers trachea when you swallow

Esophagus

Peristalsis

Stomach –churns the food and mixes with gastric juice to form chyme

Small intestine –duodenum – breaks down fat with bile from liver – enzymes from pancreas break down chyme

Pancreas

Liver

absorption
Absorption

Small 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
elimination

http://www.almightydad.com/wp-content/uploads/2009/06/baby-in-toilet.jpghttp://www.almightydad.com/wp-content/uploads/2009/06/baby-in-toilet.jpg

Elimination

Undigested materials (feces) from the large intestine pass into the rectum and are eliminated through the anus

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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.

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