kilograms (90-110 pounds)
when 15 and 50-60 kilograms
(110-130 pounds) when 20-25
years old.
The reason for this huge
difference is the fact that the
substances in the foods you consume
are added to your body in time. Some
of these foods provide the energy you
require to ride your bicycle, to run
and to play, whereas some are added
to your body and constitute your
flesh and bones. Waste matter is dis-
charged from the body. All these
processes are performed in your di-
gestive system. Organs and glands
including your stomach, intestines
and pancreas have roles in diges-
tion.
The functioning of the digestive
system is similar to the working of a
petroleum refinery. Crude oil arriv-
ing at the refinery as raw material is
processed by machines and refined
35
AG E : 1
AGE: 7
AGE : 11
