The digestive system breaks down food into tiny particles that can be absorbed by the bloodstream. Digestion begins in the mouth through chewing and saliva. Food then travels to the stomach where it is further broken down by acids and enzymes. The small intestine continues to break down food into absorbable nutrients which are then absorbed and transported to the body. The large intestine absorbs any remaining water before waste is excreted. Glands like the pancreas, liver, and gallbladder aid digestion by secreting enzymes and bile to break down proteins, fats, and carbohydrates.

1. HUMAN
DIGESTIVE
SYSTEM

2. The food that we eat is mostly solid form.
Before it can be used by the body, it must
first be turned into a soluble form. It means
that the food must be broken down into a
liquid form of every tiny particles. It is only
this form that the nutrients can be
absorbed by the blood stream and carried to
the various parts of the body.
This is the job of the digestive system.

3. MOUTH
The mouth is the beginning of
the digestive tract. In fact,
digestion starts here as soon
as you take the first bite of a
meal. Chewing breaks the food
into pieces that are more
easily digested, while saliva
mixes with food to begin the
process of breaking it down
into a form your body can
absorb and use.

4. THROAT
Also called the
pharynx, the throat is
the next destination
for food you've
eaten. From here,
food travels to the
esophagus or
swallowing tube.

5. ESOPHAGUS
The esophagus is a muscular
tube extending from the pharynx
to the stomach. By means of a
series of contractions, called
peristalsis, the esophagus
delivers food to the stomach.
Just before the connection to
the stomach there is a "zone of
high pressure," called the lower
esophageal sphincter; this is a
"valve" meant to keep food from
passing backwards into the
esophagus.

6. STOMACH
The stomach is a sac-like organ
with strong muscular walls. In
addition to holding the food,
it's also a mixer and grinder.
The stomach secretes acid and
powerful enzymes that
continue the process of
breaking down the food.
When it leaves the stomach,
food is the consistency of a
liquid or paste.

7. Small
Intestine
The small intestine loops back
and forth upon itself so much
so that it can fit into the
abdominal space it occupies. It
is held in place by tissues that
are attached to the abdominal
wall and measures eighteen to
twenty-three feet in the
average adult, which makes it
about four times longer than
the person is tall.

8. Large
Intestine
The large intestine takes
care of absorbing any water
left in the food that hasn’t
been digested yet, and then
passing any unused waste
from the body. It is one of
the final portions of the
digestive system.

9. PANCREAS
Among other
functions, the oblong
pancreas secretes
enzymes into the small
intestine. These
enzymes break down
protein, fat, and
carbohydrates from
the food we eat.

10. LIVER
The liver has many
functions, but two of its
main functions within
the digestive system are
to make and secrete bile,
and to cleanse and
purify the blood coming
from the small intestine
containing the nutrients
just absorbed.

11. Gallbladder
The gallbladder is a
pear-shaped reservoir
that sits just under
the liver and stores
bile. Bile is made in
the liver then travels
to the gallbladder
through a channel
called the cystic duct.

12. Prepared By:
HANNAH MEI B. LABASAN
BEEd 3-2 DAY