Transcript The Digestive System - Bibb County Schools

The Digestive System
Chemical change turns food into a
new form: a form that cells can use.
Digestion is the process of changing
food into a form usable by the cells of
the body
Where does digestion begin?
Digestion begins
in the mouth.
What role does saliva play in
digestion?
Enzymes in
saliva help to
break down food.
Salivary amylase
begins digestion
by breaking
down starches.
What are enzymes?
Enzymes are
chemicals that
speed up the
rate of chemical
change by
breaking down
food.
What mashes and cuts food in your
mouth?
Your teeth
mashes and cuts
food in your
mouth.
What moves food through to your
stomach?
The esophagus
moves food from
the back of the
throat through to
the stomach by a
process called
peristalsis.
Peristalsis
What is the baglike, muscular organ that
mixes and chemically changes protein?
The stomach is the
muscular organ
that mixes and
chemically
changes protein.
When they reach the stomach,
mashed-up food particles mix with
gastric juice.
What type of acid breaks down
food in your stomach?
Gastric juice
contains
hydrochloric
acid, which
breaks down
food in your
stomach.
The mashed up
food moves from
the stomach to
the small
intestine.
Sphincters
Where does most digestion in the
small intestine take place?
Most digestion takes place in the small
intestine. In the small intestine, the
duodenum does most of the digestion.
How long is the small intestine?
The small intestine is seven meters
(22 feet) long.
What organs produce enzymes that
help in digestion?
The pancreas and the liver produce
enzymes that help in digestion.
The liver’s role is to _____.
1. Remove harmful
substances from the
blood
2. Make bile, which is
used in digestion to
break up fats
3. Control blood sugar
levels
Your food can spend up to 4 hours in
the small intestine.
Food passes from the small
intestine into what organ?
Food passes
from the small
intestine into the
large intestine.
What is the main role of the large
intestine?
The main role of the large intestine is
to absorb water from waste.
The large intestine measures about 5
feet long.
After leaving the large intestine,
waste is removed from the body via
the rectum and anus.
Under normal circumstances, it takes 21
hours for food to pass entirely through the
digestive system of a healthy human.