Page 16 - Science Class 07

Inges on NUTRITION IN HUMAN BEINGS

In order to provide the energy necessary for The nutri on in human beings is carried out by
growth and carry on life’s ac vi es, we must different organs.
eat food or take food into the body. The We can group these organs into:
process of taking food into the body is called
v Diges ve Tract v Glands
inges on. In most simple terms, inges on
means ‘ea ng of food’ by the animal. When we Diges ve Tract
put food into our mouth with hands, we are The diges ve tract is a series of structures and
inges ng (ea ng the food). organs through which food passes during its

Diges on processing into absorbable form into the blood
stream and also the structure through which
Diges on is the process by which food is
solid wastes passes in the process of elimina on.
dissolved and chemically converted so that it
can be absorbed by the cells of an organism Glands
and used to maintain vital body func ons. Glands secrete several chemical substances
Absorp on that help in the diges on of food. There are
different types of glands in our body that
A er diges on, the food molecules become
secrete different chemical substances. The
small and soluble. The soluble food molecules
diges ve glands secrete enzymes which help in
can pass through the walls of our intes ne and
diges on of food.
go into blood. The process in which the
digested food passes through the intes nal
wall into blood stream is called absorp on.
Mouth Salivary Glands
Assimila on

Blood carries the absorbed food to all the parts Oesophagus
of the body. The food then enters each and
every cell of the body where it is used for Liver Stomach
producing energy and for making materials for
Gall
the growth and repair of the body. The process
Bladder Pancreas
in which the absorbed food is taken in by body
cells and used for energy, growth and repair, is
called assimila on. Large
Intestine Small
Eges on Intestine
The whole food which we eat is not digested by Appendix Anus
our body. A part of the food which we eat Human Diges ve System
remains undigested (or insoluble) which cannot

be used by the body. This undigested part of IMPORTANT ORGANS INVOLVED IN
the food is then removed from the body in the NUTRITION AND THEIR FUNCTIONS
form of faeces when we go to toilet. The Let’s discuss about different organs involved in
process in which the undigested food is the nutri on and their func ons. It starts from
removed from the body is called eges on. the mouth and ends at the anus.

16 Science-7