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Let us know about the Inspiration Expiration

breathing. The number of
Chest
times a person breathes in expands Chest
a minute is called the reduces

breathing rate. An adult
Diaphragm
person's breathing rate, at
rest is 15–18 times per Diaphragm Diaphragm

minute. It increases during contracts relaxes

heavy exercises and slows down when you sleep.

SPIROMETER
The volume of air inspired and expired by the lungs is

measured by spirometer. The spirometer is use to rate
the amount of air that is breathe in and out over a

specific period of time.

How a spirometer works? In a spirometer test, we breathe into a mouth piece
that is connected to an instrument called a spirometer.

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Quenching Your Scientific Thirst
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w An average person breathes in 21,600 times per day.
w Sighing or yawning is a sign that you are not getting enough oxygen.

Scientific Terms
Cavity : a hollow space
Epiglottis : the thin elastic cartilaginous structure located at the root of the
tongue

Exchange : the act of substituting one thing in the place of another
Organ : the internal part of our body
Rib cage : the enclosing structure formed by the ribs and the bones

Chapter at a Glance
³ Breathing is a physical movement associated with the gaseous exchange.

³ Respiratory system consists of : Nostrils, Nasal Cavity, Larynx, Trachea, Bronchi and
Lung's alveoli.

³ Inspiration is the act of breathing in and expiration is the act of breathing out.
³ The volume of air inspired and expired by the lungs is measured by spirometer.

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