Transcript The_Respiratory_System

KS4 Physical
Education
The Respiratory System Part 2
Gas Exchange
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Gas exchange at the alveoli
The alveoli are bunches
of tiny air sacks inside
the lungs.
Each individual sack is
called an alveolus.
When you breathe in,
they fill with air.
The alveoli are covered in tiny capillaries (blood vessels).
Gases can pass through the thin walls of each alveolus and
capillary, and into the bloodstream.
Gases can also pass from the bloodstream into the alveolus.
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Gas exchange at the alveoli
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Composition of inhaled and exhaled air
21%
17%
Very small amount
3%
79%
79%
Small amount
Large amount
What are the main differences between
inhaled and exhaled air?
Why does mouth-to-mouth resuscitation work?
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The nasal passages and lungs
Air is drawn into the body via the nose or mouth.
There are advantages to breathing through your nose:
the air is warmed so that it is
closer to body temperature
tiny hairs and mucus in the nose filter
the air, preventing larger dust and
pollen particles reaching the alveoli
mucus moistens the air, making it
easier for the alveoli to absorb.
What are the advantages of being able to breathe through
your mouth as well?
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The respiratory system
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