DIGESTIVE SYSTEMBy: 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

• 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?

1. Ingestion

2. Digestion

3. Absorption

4. Elimination

Four Stages of Digestion

• Process of putting food or drink into your mouth

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

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

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

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

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

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.