Transcript Digestive System 06-02-2011_digestion

06-02-2011
Warm-Up
1) List all the organs you
know.
2) List all the functions you
can of the organs you
listed.
Evolution Projects Due Tomorrow!
Fast Facts
Taking Notes….
-
Fill in the organ functions as we go
-
Write down any other interesting facts you
learn
-
? Next to things you don’t understand
* things you think are interesting
-
The Digestive System
Copy the table in your notebook
Tape in the diagram
How is food digested?
Digestion involves -
Breaking down of food into smaller pieces
 The mixing of food
 Movement through the digestive tract
 Chemical breakdown of the large
molecules of food into smaller molecules.

Mouth

Main function = break apart food using
teeth and saliva so food is moist and
carbohydrates can be digested
Esophagus

It moves food by waves of
muscle contraction from
the mouth to the stomach.
Stomach

The stomach has thick muscles in its wall which
contract to mash the food into a water soup called
chyme.

The stomach lining produces strong digestive
juices (like HCL) which break down and dissolve
nutrients.

Nutrients are broken down
small enough to pass
through the lining of the
small intestine, and into the
blood (diffusion).

Nutrients are carried away
to other body parts to be
processed, stored and
distributed.
Small
Intestine
Factoid = 20 feet long

Absorbs water and body
minerals through the
walls of the large
intestine, back into the
blood.

The remains are formed
into brown, semi-solid
feces, ready to be
removed from the body
Large Intestine
Rectum and Anus
(yes, we’re talking about butts)

The end of the large
intestine and the next part
of the tract, the rectum,
store the feces.

Feces are finally squeezed
through a ring of muscle,
the anus, and out of the
body.
Pancreas

Makes digestive juices called enzymes
which help to digest food when emptied
into the small intestines.
Gall Bladder

A small baglike part under the liver.

Main Function: It stores a fluid called bile
which flows into the intestines to help
digest fatty foods.

The liver is like a foodprocessing factory with
more than 200 different
jobs.

M.F =It stores some
nutrients, changes them
from one form to another,
and releases them into the
blood according to the
activities and needs of the
body.
Liver
Did you get them all?
Identify the organs of the digestive
system
Describe the digestive system
The digestive tract is a series of
hollow organs joined in a tube
from the mouth to the anus.
Digestive system is one long
 Food passes through the digestive
tract.tube that moves and breaks
 Helpful
organs
include
down
our
food.the liver,
gall bladder, and pancreas. Food
does not pass through these
organs but they help the process.

(Can someone summarize this
page?)
Warm-Up
06-03-2011
Magic School Bus For
Lunch
http://www.youtube.co
m/watch?v=r8O8ywW2f
V4
For more information about
the digestive system, click
here:
http://kidshealth.org/kid/body/dig
est_noSW.html
To quiz yourself over the
parts of the digestive
system, click here:
http://www.tvdsb.on.ca/westmin/
science/sbi3a1/digest/digdiag.htm