Page 27 - Science - 5

3 Inhaling and Exhaling

Inside l Respiration
Inside
the l Functions of respiratory organs
the
Chapter
Chapter
l Spirometer

RESPIRATION
Respiration in human beings is called breathing . Wind pipe
(trachea)
Our mouth and nose are the gateway to our
Air passages
respiratory system. When we breathe through (bronchi)

nose, the air passes through mouth and goes to
Left Lung
the trachea. The trachea is the passageway

leading to the lungs. The epiglottis guards the
trachea so that food can’t get down it. Every

time you keep breathing in and out whether you
are awake or asleep. The air we inhale, is the Respiratory System

combination of gases like nitrogen oxygen carbon dioxide dust water , , ,
,
vapours, and other particles.

Knowledge Plus

The body removes its waste products by percentage as :

70% by breathing 20% from skin 7% by urination 3% defecating

BREATHING SYSTEM AND FUNCTIONS OF DIFFERENT ORGANS
'Breathing' is a physical movement associated with the gaseous exchange.

When we breathe in, the air we inhale passes through a system of organs
known as the Respiratory System . This system consists of :

Nostrils"Nasal cavity"Larynx"Trachea "Bronchi " Lung's alveoli

Role of Nostril
Role of NostrilRole of Nostril
The oxygen-rich air is taken in by the nostrils. The natural air contains about

21 per cent oxygen and 0.03 per cent carbon dioxide. The amount of oxygen is
more in the air we breathe in.

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