Page 120 - Science Class 06

SOME IMPORTANT LIFE PROCESSES OF Respira on
HUMAN BEINGS The respiratory system consists of all the

All the animals whether unicellular or organs involved in breathing. These include
mul cellular, perform various life processes the nose, pharynx, larynx, trachea, bronchi

to live. and lungs. The respiratory system does two
Some of the important func ons are very important things—it brings oxygen into

diges on, respira on, excre on, move- our bodies, which we need for our cells to
ment, reproduc on, etc. Let’s study about live and func on properly; and it helps us
these func ons taking the example of get rid of carbon dioxide, which is a waste
human body. product of cellular func on.

Diges on

The energy required for all the processes
and ac vi es that take place in our bodies Nasal cavity
Nostril
is derived from the food we ingest. The Oral cavity Pharynx
diges ve system allows us to u lise food
Larynk
from such diverse sources as meat from an Trachea
animal and the roots of a plant, and u lise
Right main Le main
them as an energy source. Whether it is the bronchus bronchus
Right lung
ability to coordinate the chewing of the Le lung
food without injuring our tongue and lips or
Diaphragm
the propulsion of the food from the
stomach into the duodenum while releasing
Respiratory System
the appropriate enzymes, our diges ve
system allows us to manage the process
Circula on of Blood
without much thought and o en while
performing other tasks. The blood circulatory system (cardiovascular
system) delivers nutrients and oxygen to all
Organs Involved in Diges on
cells in the body. It consists of the heart and
Mouth, teeth, tongue, food
the blood vessels running through the
pipe or esophagus, stomach,
en re body. The arteries carry blood away
small intes nes, large
from the heart; the veins carry it back to the
intes ne, glands which secrete
heart.
various diges ve juices called
enzymes. Organs nvolved in lood ircula oni b c are
heart, blood, arteries, veins.

Diges ve System

120 Science-6