Download The Respiratory System

The Respiratory
System
By: Katherine Pease
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookRESPSYS.html
http://www.lung.ca/children/grades7_12/respiratory/respiratory_system.html
Take a big Breath….
Did your chest move?
Why?
Your Respiratory system
is at work.
My what system?
Respiratory System
–The integrated system of organs
involved in the intake and exchange
of oxygen and carbon dioxide
between an organism and the
environment.
In other words….
http://kidshealth.org/PageManager
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Let’s Take a trip through
your Respiratory
System….
follow me
First Stop in respiratory system…
Air enters the body through the
nose, is warmed, filtered, and
passed through the nasal
cavity.
Air can also enter through your
oral cavity, your mouth.
Second Stop in respiratory system…
The Air then passes into the
pharynx
Then into the upper part of the
trachea
–The trachea contains the larynx.
In the Larynx are your Vocal Cords.
The vocal cords are two
bands of tissue that extend
across the opening of the
larynx.
These control the way you
sound when you speak.
Third Stop in respiratory system…
After passing the
larynx, the air
moves into the
bronchi that carry
air in and out of
the lungs.
Your Bronchi are…
Tubes that carry air from the
trachea to the lungs (sing.:
bronchus
These tubes take the air into
your lungs
Once inside the Bronchi…
Air moves into smaller tubes
known as bronchioles.
From there they terminate in
grape-like sac clusters known
as alveoli.
Alveoli are…
Tiny, thin-walled, inflatable sacs in the
lungs where oxygen and carbon
dioxide are exchanged.
They are surrounded by a network of
thin-walled capillaries.
Remember: Capillaries are blood
vessels that O2 and CO2 diffuse
through
What helps to move this air in and
out of your lungs?
That would be your diaphragm.
Diaphragm is a dome-shaped
muscle that separates the thoracic
and abdominal cavities.
How does my diaphragm do this?
Through the process of
ventilation
Ventilation is: The mechanics of
breathing in and out through
the use of the diaphragm and
muscles in the wall of the
thoracic cavity.
In other words….
When you inhale, muscles in the
chest wall contract, lifting the ribs and
pulling them, outward. The diaphragm
at this time moves downward
enlarging the chest cavity. Reduced
air pressure in the lungs causes air to
enter the lungs. Exhaling reverses
theses steps.
This a diagram of Ventilation.
Also see website to see in action:
http://www.smm.org/heart/lungs/top.html
Let’s Review….
Use this information to fill in your
diagram of the respiratory system.