Transcript The Digestive System - Laing Middle School

The Digestive
System
:Ad-Lib Game:
http://www.youtube.com/watch?v=Z7xKYNz9AS0
Functions
 Digest the food we eat
 Take the nutrients out of your
food so your body can use it
Chemical Digestion
When chemicals in our body
take large molecules &
break them down into
nutrients our body can send
through our blood
 Saliva, stomach acid do this
EWW!!! What is that??
 http://www.youtube.com/watch?v
=Uzl6M1YlU3w
Chemical Digestion Demo…
 Put skittle in your mouth
 DO NOT CHEW OR MOVE WITH
TONGUE
 *Remember what color you had 
 After about 30 seconds take it
out…this is chemical digestion. Your
saliva has broken down the sugar
molecules so that they can be
absorbed into your blood
Mechanical Digestion
The physical breaking
and crushing of food
 Teeth, tongue, movement
of smooth muscle in
peristalsis (squeezing of
tubes to move/crush food)
do this
Mechanical/Physical Digestion
 Now Chew the skittle & move
around with your tongue!
 This is physical or mechanical
digestion! Breaking the food
down into smaller pieces by
ripping, crushing, and tearing
it.
Components







Esophagus
Stomach
Small Intestine
Large Intestine
Gall bladder
Liver
Pancreas
Esophagus
the tube that connects
your mouth and your
stomach
Stomach
 A stretchy bag that holds your
food after you eat
 Helps to break food into
smaller pieces so your body
can use it for energy and
nutrition
Esophagus
Stomach
Small Intestine
 Tube that is 20 feet long.
 Where nutrients is absorbed into
the blood.
 Food stays in your small intestine
for 4 to 8 hours
Small
Intestine
Large Intestine
 Tube that is 5 feet long
 Gets waste from small intestine
 Liquids are absorbed here
 Waste stays for 10 to 12 hours
Large Intestine
Gall Bladder
 Storage tank for bile (a greenishyellow liquid) that helps your body
break down and use fats
 Located under your liver
 Shaped like a pear
Gall
Bladder
Liver
 Factory for antibodies and bile
 Stores vitamins and sugars until your
body needs them
Liver
Pancreas
 Helps you
digest food by
breaking
down sugars
Your homework…
 The Journal of a Hamburger
 Write the process of mechanical
digestion as it goes through the
mouth, esophagus, stomach, small
intestine, large intestine, and rectum.
 Use information from the Magic
School Bus to complete for tomorrow.
(First column only!)
The Magic School Bus!
 Complete the
diagram as your
watching!
 http://www.gamequarium.org/dir/Sq
oolTube_Videos/Science/Human_Bod
y/Digestive_System/magic_school_bu
s_for_lunch_9673.html
Healthy Habits
Eat foods
that are high
in fiber like
fruits and
vegetables
Drink plenty of
water
Chew your food completely
before you swallow
Avoid foods high in fat
Interesting Facts
Food is in your digestive
system for about 24 hours
Your stomach stretches
when you eat like a
balloon being filled with
air
You have a trap door called
the epiglottis to cover your
windpipe when you
swallow.
Your stomach mashes your
food the way a baker
kneads dough for bread.