The document discusses the respiratory system and the process of breathing. It explains that gas exchange occurs in the lungs through the trachea, bronchi and bronchioles into tiny air sacs called alveoli. Oxygen passes from the alveoli into the bloodstream while carbon dioxide passes out of the bloodstream and into the alveoli. When we inhale, oxygen enters the body and when we exhale, carbon dioxide is released. The alveoli have a large surface area and tiny blood vessels to efficiently facilitate this gas exchange.

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Being Healthy

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The Respiratory System
• Gas exchange happens in the lungs.
• You have 2 lungs, situated in your upper
thorax / chest
• Here, oxygen and carbon dioxide are
exchanged – oxygen is needed for life and
carbon dioxide is got rid of when we breathe
out.

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How do we breathe?
Mouth 
Windpipe/trachea 
bronchi 
bronchioles 
alveoli 
blood

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Inhalation
(When we breathe in we inhale)

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Exhalation
(When we breathe out we exhale)

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Exchanging gases

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The Alveoli
The outside of the alveoli is covered with tiny blood
vessels.
Oxygen makes its way into thousands of special air
sacs collectively called the ALVEOLI.

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The Alveolus
One of these alveoli is called the ALVEOLUS.
This is where the oxygen is transferred into the blood and carbon dioxide
moves out of the blood.
If all these alveoli
flattened and
spread out onto
the floor, they
would cover an
area the size of a
tennis court!

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Comparing inhaled and exhaled air
What are the big differences between inhaled and exhaled air?
How could you test for these?
There is another difference…… …… water vapour.
Inhaled Air
Nitrogen (78%)
Oxygen (20.71%)
Carbon Dioxide (0.1%)
Other
Exhaled Air
Nitrogen (75.5%)
Oxygen (14.6%)
Carbon Dioxide (4%)
Other

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Lets take a closer look (avi)

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Backup of as wmv file

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Thanks
Submitted by
Harshit Pandey
St. johns Public School

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If you also want to share your own or your kid’s
presentation(ppt) please send it on
info@makemegenius.com

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www.makemegenius.com– Full of ingredients to make your child a genius.
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