The Digestive System: Model

1. = Accessory Organs: it is when the
food DOESNʼT travel in these organs;
Tongue, Teeth, Salivary Gland, Liver, Gall
Bladder, Pancreas
= Digestive Tract: it is when the food travels to
these organs; Mouth, Esophagus, Stomach,
Small Intestine, Large Intestine, Rectum, Anus
Sarah Kim
THE DIGESTIVE SYSTEM
Mentos :)
Feces (poop)
Mouth
Esophagus
Liver
Gall bladder
Stomach
Pancreas
Large Intestine
Small Intestine
Anus, Rectum

2. Sarah Kim
The MOUTH and ESOPHAGUS
Mouth:
When you chew your food with your teeth, it mixes with your tongue and your saliva. The
saliva makes your food soft to sends it through the esophagus.
Esophagus:
The esophagus is a muscular tube that takes the food to move down the esophagus to the
stomach. The smooth muscles in the wall of the esophagus move food downwards with a
squeezing action, and this action is called peristalsis. The waves of muscle contractions
move food through the entire digestive tract.

3. Sarah Kim
The STOMACH, LIVER, GALL-BLADDER and PANCREAS
Pancreas:
The pancreas makes
insulin which is a hormone
that allows the glucose to
pass from the
bloodstream to your cells.
Liver:
The liver help you by
producing bile to
digest food. Bile
breaks down grease.
Gall Bladder:
It is where they
store bile until it
is needed.
Stomach:
In the stomach, food is mixed by peristalsis. Food is also mixed with very strong
hydrochloric acid to break it down. The acid also destroys bacteria and produces
mucus that makes the food slippery and protects the stomach. Food moves through
your stomach until it changes to a thin, watery liquid called chyme. Chyme moves out
of your stomach to your small intestine.

4. Sarah Kim
The LARGE INTESTINE and SMALL INTESTINE
Absorbing nutrients
Poop : Feces(its actually
mentos. I just colored it brown)
Large Intestine:
The main job of the large intestine is absorbing water from the undigested food.
When the water is all absorbed, the undigested food becomes more solid.
Small Intestine:
When chyme leaves your stomach, it enters the small intestine
first called the duodenum. In the small intestine, bile is added. It
is to break up large and fat particles to float at the top of the
liquid. (same way as breaking the grease). The wall of the small
intestine is covered with villi. Villi increases the surface area so
that nutrients in the chyme have MORE places to be absorbed in
the small intestine. Finally, the blood transport all the nutrients to
all your cells of your body. Peristalsis soon makes all the
undigested and unabsorbed food go into the large intestine.

5. Sarah Kim
The ANUS and RECTUM
Rectum:
The rectum is where the urine is stored
for indigestible and waste!
Anus:
It is an opening end of the rectum. It is
also where the feces comes out.

6. How does the motar and
pestle work like your teeth?
The motar and pestle act
like your molar teeth. This is
done so because both
pestle and molar teeth have
flat surfaces to grind the
food easily. The flat surfaces
are efficient in breaking the
food into smaller pieces
because it creates larger
area to grind the food.
However there is a
difference that when
humans grind food in our
mouth using the teeth, we
can not chew the food for
long periods of time.
Sarah Kim
THANK YOU :)