Download Digestive System

Digestive System
What happens to the food you
eat once you swallow it?
Food Follows A Path Through
Our Body
• Food enters our body through our mouth
• Digestion begins as soon as food is placed
in our mouth
• Try it with a cracker……
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Put a the cracker on your tongue
Don’t bite it or chew it!
What do you taste?
What do you feel happening?
Describe what happened to your
cracker
• Did it get soft and soggy without you
chewing it?
• Did you notice a sweet flavor?
• The saliva in your mouth begins to break
down food as soon as it enters your mouth.
• Saliva is produced in the salivary glands.
• The
pink pictures show our
salivary glands
Digestion Begins:
• Digestion begins when
these enzymes in your
saliva start to break away at
the food you are eating.
• Your teeth continue to help
the digestion process as
they grind up the food.
• Your tongue also helps
digestion when it pushes
your food around so it can
be broken down.
Then you swallow
• The food you
swallow goes down
your esophagus,
which is the tube
that takes it from
your mouth into your
stomach.
•A flap called the epiglottis
closes over the trachea
so food doesn’t go into
your lungs and choke
you!Instead food goes
down the esophagus!
Now it’s in your Stomach
• Once food is in your
stomach it will stay
there for 3-4 hours so it
can be broken down
even more!
• Stomach acids mix with
the food and turn it from
chunks that we could
recognize into a thick
paste called chyme.
• It doesn’t even look like
food bits once it’s
turned into chyme
The Next Step
• Once chyme is made it is passed into
the first part of the small intestine.
• It is here where more juices are added
to the chyme to help continue the
digestive process.
The Liver and Gall Bladder
and Pancreas
• The Liver makes bile which is a green
juice that helps with digestion.
• The Gall Bladder stores the bile the liver
makes until it is needed and shot into
the duodenum (small intestine).
• The Pancreas also makes juices that
will help break down the chyme.
• The Pancreas makes pancreatic juices.
The Small Intestine
• The small intestine can be
18-23 feet long!
• The small intestine is where
the nutrients pass into the
blood stream so that the
plasma can take it to our
body’s cells.
• Small finger-like projections
called villi grab at the
nutrients and pass them
into our blood stream.
Next Stop: Large Intestine
• Once the digested material is through the
small intestine it is moved into the large
intestine.
• The large intestine gets it’s name because it
is bigger around than the small intestine.
• The large intestine is only about 5 feet long.
• The Large Intestine takes whatever liquid is
left, out of the material, leaving a more solid
matter.
• This is all of the waste materialfrom the foods
we eat that our body can’t use.
• What goes in must come out! Through the
The Digestive System
The Digestive Path of Food–
Let’s write it out!
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Mouth
Esophagus
Stomach
Small Intestine
Large Intestine
Rectum/Anus
Does food ever go in the liver, gallbladder, or
pancreas?
• NO!!!!!!!
So where do the liver, gall
bladder and pancreas fit in?
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Mouth
Esophagus
Stomach
Gall bladder and Pancreas shoot juices into
the:
Duodenum
Small Intestine
Large Intestine
Rectum/Anus