Download Notes: Digestive System

Human Systems
Part 2
Digestive System
I-Digestive System: breaks down food
into a usable sugar molecule called
Glucose.
A-Digestion starts in the mouth.
1- Food is broken down chemically
by salvia produced by salivary
glands.
2- Food is also broken down
physically by the teeth and
tongue.
3. The food is then passed into the
esophagus or food tube which leads to
the stomach.
4. In the stomach, food is broken down
chemically by the enzymes bile and
gastric juices, also hydrochloric acid
which is not an enzyme. It is also broken
down physically by the stomach muscle
carrying out peristalsis.
5. From the stomach, the food passes into the
small intestine where most of the digestion of
food takes place. In the small intestine are
Villi which absorbs glucose into the
bloodstream.
6. From the small intestine the
undigested material now passes into
the large intestine, excess water is
absorbed and the undigested material
is now called Feces.
Digestive
System
Salivary glands
Mouth
Esophagus
Liver
Gall bladder
Stomach
Pancreases
Appendix
Sm. Intestine
Lg. Intestine
7- The enzyme bile is made in the liver
and pancreases and stored in the gall
bladder till it is needed.