The
Digestive
System
Lesson5– Digestive System
Model
:
• Students will gain a full understanding of
how the digestive and excretory system
work in their own bodies.
• Students will be able to name the parts of
the digestive system.
• Students will be able to describe the path
of food through the digestive system.
• System will be able to assemble a model
of the digestive system.
 What
is the first part of the
digestive system?
 What is the second part of
the digestive system?
 What is the third part of the
digestive system?
 What is the fourth part of the
digestive system
 Describe to a partner how
the all the parts work
together to digest food.
pancreas:
an organ that
creates bile to help in the
digestive system
liver: an organ that cleans
the digestive system
You
will be making a model of the
digestive system but, first you need to
build your knowledge.
Review your experiment recording
sheet and what you’ve learned for
that sheet.
Model- mouth
 Digestion
begins in the mouth
where teeth chew food,
breaking it into smaller and
smaller pieces and where
saliva, flowing out of salivary
glands, softens and moistens
chewed food.
 Direction:
 color and cut out the head
models. Then glue the tabs
together.
Model- esophagus
 The
tongue pushes small bits
of food to the back of the
mouth into the throat. throat
muscles direct the food balls
into the FOOD TUBE, or
esophagus, where muscles
keep it moving to the
stomach.
 Direction:
 color and cut, then glue the
parts together.
Model- Stomach
 The
muscular, elastic
STOMACH mashes and
churns the food. The
stomach wall releases
digestive juices that break
down food. As the stomach
churns, food turns into a thick
paste called chyme.
 Direction:
 color and cut, then glue the
parts together.
Model- Small Intestine

Chyme leaves the lower part and enters
the SMALL INTESTINE. The wall of the small
intestine gives off different digestive juices,
but there’s are not enough. The gall
bladder and LIVER make bile that flows
through a duct help break down the food.
the PANCREAS produces enzymes-rich
juices that flow through the duct to further
break down food. These are picked up by
million of VILLI which absorb the nutrients
into the blood.
 Direction:
 color
and cut, then glue the parts
together.
Model-Large Intestine

Parts of food the body cannot use are
moved along by muscles in the small
intestine wall into the LARGE INTESTINE wall.
Most of the water and minerals left in the
unusable food parts pass through the wall
of the large intestine into the blood. The
rest gets hard and is stored in the rectum
until it is released from the anus. the
opening at the end of the large intestine.
 Direction:
 color
and cut, then glue the parts
together.
Use
the model to identify the
parts of the digestive system to
a partner and how they are
used.
Then listen as they identify the
digestive system and explain
how they are used.
Watch Meeeeeee!!
 Video
on the disgestive system
 https://www.youtube.com/watch?v=Vwrs
L-lCZYo