Download Respiratory System – Expert Group Task

Respiratory System
To respire means to breathe.
Respiration = Breathing
Get into Expert Groups
•
•
•
•
Yellows: The nose
Reds: The mouth as an Alternative
Greens: The windpipe
Blues: The lungs
The Nose
Mucus lining in
nasal cavity
• Air is taken into and removed
from the body through the nose.
• The hairs in the nostrils help to
remove the dirt and dust that is in Nasal
the air.
hairs in
nostrils
The Nose
• The moisture of the mucus
lining in our nasal cavity also
helps to trap contaminating
particles.
• This helps to ensure that the air
we breathe in is clean and free of
dust.
The Mouth as an Alternative
•When someone gets infected with
influenza (flu), his nose is often stuffed up
by mucus. Thus, air cannot enter the body
through the nose.
•We can still breathe through our mouth.
The Mouth as an Alternative
•However, the mouth is not a
respiratory organ.
•So, the air entering the mouth will
not be filtered, and its temperature
will not be controlled.
The Windpipe
•The air we breathe in through our nose
then moves down through the windpipe
(trachea).
windpipe
lungs
•The windpipe branches into two air tubes
(plural bronchi or singular bronchus).
•The windpipe and air tubes transport the air
to and from the lungs.
air tubes
•The windpipe is made up of many Cshaped rings that reinforce the front
and sides of the windpipe to protect
and maintain the airway.
•The trachealis muscle connects the
ends of the incomplete C-rings and
contracts during coughing, reducing
the diameter of the windpipe to
increase the rate of air flow.
C-shaped rings
The Lungs
•The windpipe and air tubes transport the air
to and from the lungs.
•The windpipe branches into two air tubes
(plural bronchi or singular bronchus).
windpipe
lungs
•Each air tube leads to one of the lungs.
air tubes
The Lungs
•The air tubes (or bronchi) will
branch out even more into small
tubes, called bronchioles, in the
lungs.
•The bronchioles of the air tubes
will end at the tiny air sacs called
alveoli .
•The bronchioles of the air tubes will end at
the tiny air sacs called alveoli .
•Each alveolus is wrapped up in a fine mesh
of capillaries (blood vessels).
•The blood in the capillaries transports
oxygen to all parts of the body and brings
carbon dioxide from all parts of the body.
•The gaseous exchange between oxygen in
the air we breathe in and the carbon dioxide
in the blood takes place between the
capillaries and alveoli.
14
15
The Lungs
• This is how gaseous exchange takes place
during respiration.
• When oxygen in the inhaled air reaches the
lungs, it is absorbed into the blood and
transported to all parts of the body.
• Carbon dioxide is also transported by the
blood to the lungs. It is then removed
from the body during breathing.
16
lungs
Think about it…
The air we breathe in has
more oxygen and less
carbon dioxide and water
vapour than the air we
breathe out.
Do you agree
with Joe? Why?
17
Think about it…
blood vessels
air sacs
How does having many air sacs in the lungs help to make the
exchange of gases efficient?
18