Transcript The Digestive System.ppt

The Digestive System
By Alexei Burtscher
Diana Rumrill
Heather Wright
Shiro Hatori
Vickie Mun
What is it?
• Made up of the digestive tract
• Helps the body breaks down and absorb
food
• 3 Functions:
– Digestion
– Absorption
– Elimination
Teeth
• To chew food
• Used to pronounce words better
• To have a pleasant appearance
Tongue
• Used to taste food
• Helps you speak better
• Principally in chewing, swallowing, and
speaking
Epiglottis
• Allows air to pass through the larynx
• Prevents food and drinks from entering the
wind pipe
Esophagus
• The tube that connects the throat with the
stomach
• About 10 inches long in an adult
• The muscular walls contract to push food
down to the stomach
Small Intestine
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Finishes the process of digestion
Absorbs the nutrients
Passes the residue onto the large intestine
Divided into the duodenum, jejunum, and
ileum
Stomach
• Digests food with stomach acid and other
digestive juices
• Absorbs alcohol
• 12 inches long
• Made out of 5 layers
Large Intestine
• Transports waste out of the body
• Tries to take the water in before the
wastes leaves the body
• Connected to the smaller intestine
Liver
• The largest gland in the
human body
• Has 3 roles:
– Vascular functions
– Metabolic achievements
– Secretory and excretory
functions
Gallbladder
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A small pear-shaped muscular sack
A storage tank for bile
100 to 120 mm long
Dark green
Pancreas
• Elongated, tapered organ
• Located across the back of the
abdomen
• 2 types of tissue:
– endocrine tissue
– exocrine tissue
• Digestive and hormonal functions
Anus
• External opening of the
rectum
• Feces are expelled from the
body through the anus during
the act of defecation
• The anus plays a role in
sexuality, though attitudes
towards anal sex vary and it is
even illegal in some countries
How much food can the average
stomach hold?
• The largest volume a human body can
hold is 6 quarts
• It can expand up to 50 times it’s normal
size
What are villi and what is their
function?
• They are hair-like
protrusions in the
intestines
• They capture nutrients
from the food
• Slow down the passage
of food
Works Cited
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http://wiki.answers.com
www.wikipedia.org
www.coloncaner.about.com
http://www.bodyteen.com/andist.html
http://www.kidshealth.org/kid/htbw/digestiv
e_system.html