Transcript Chapter 3 Lesson 2

Chapter 3 Lesson 2
What is the Respiratory System?
What is the job of the respiratory
system?
The respiratory system carries gases
between the outside air and your blood.
Your respiratory system is at work
whenever you smell, sing, talk, laugh, or
breathe.
The parts of the respiratory system
include:
Trachea
Bronchioles
Air sacs
Diaphragm
Larynx
A closer look at the parts
The trachea is a tube
that carries air from
the larynx to the
lungs.
The larynx contains
your vocal cords.
The bronchioles are
smaller tubes from
bronchi that branch
out from the trachea.
The diaphragm is a
muscle in the bottom
of the chest area that
contracts with
breathing.
Air sacs are where
oxygen enters the
blood and carbon
dioxide leaves the
blood. They are also
called alveoli.
More About the Air Sacs
Air sacs walls are covered with a web of
tiny blood vessels called capillaries.
Larynx, Trachea, and Bronchi
Bronchioles, Air Sacs, and
Diaphragm
How we breathe
Several muscles work together when you
breathe. When you inhale, your diaphragm
contracts and moves down, making more
space in your chest. Your rib muscles may
also pull your rib cage up and out, making
still more space. Air quickly rushes into the
lungs and takes up the new spaces. When
your diaphragm and rib muscles relax,
they push air out of the lungs.
Look at the picture on the next slide to see
how we breathe.
How do the respiratory system and the
circulatory system work together?
In humans, the respiratory and circulatory
systems work together to get oxygen to the cells.
The respiratory system gets air all the way to
your air sacs where the blood (circulatory
system) picks it up there and carries it all to your
cells.
In the air sac, oxygen leaves the lungs and
enters the blood and carbon dioxide leaves the
blood and enters the lungs.
Respiratory and Circulatory Systems
working together continued….
Holding your breath causes carbon dioxide
to build up in your blood. Your brain can
sense this, so it sends a message to the
diaphragm and rib muscles telling them to
breathe.
Diseases of the Respiratory
System
Cold- runny nose,
stuffy nose, sneezing
Influenza- cough,
sore throat, stuffy
nose, fever
Pneumonia- cough,
chest pain, shortness
of breath, fever
Tuberculosis- cough,
fever, wheezing
Lung cancer- lung
cells grow incorrectly
and very quickly
What have we learned today?
The respiratory system carries what
between the outside air and your blood?
Name the parts of the respiratory system.
What cover the walls of air sacs?
How do the respiratory system and
circulatory system work together?
Hold your breath for ten seconds. What
just built up in your blood?
Name 2 diseases of the respiratory
system.