The Respiratory System
Lesson 3: Standard 9a. Students know how
the complementary activity of major body
systems provides cells with oxygen and
nutrients and removes toxic waste products
such as carbon dioxide
What have we learned so far?
• The definitions of
specialized cells, tissues,
organs, and organ
systems
• The body is kept in
homeostasis (balance) by
the actions of different
organ systems working
together
• Feedback inhibition is
the mechanism for
maintaining homeostasis
in the body
What have we learned so far?
• The major parts of and
the types of blood
vessels in the circulatory
system and The veins,
arteries, valves, and
chambers of the heart
• The direction of blood
flow through the heart
• Pulmonary and systemic
circulation
The Human Respiratory System
The function of the
respiratory system is
to bring about the
________ of oxygen
and carbon dioxide
between the ___,
the ______, and the
________.
The Human Respiratory System
The function of the
respiratory system is
to bring about the
exchange of oxygen
and carbon dioxide
between the ___,
the ______, and the
________.
The Human Respiratory System
The function of the
respiratory system is
to bring about the
exchange of oxygen
and carbon dioxide
between the air, the
the ______, and the
________.
The Human Respiratory System
The function of the
respiratory system is
to bring about the
exchange of oxygen
and carbon dioxide
between the air, the
blood, and the
________.
The Human Respiratory System
The function of the
respiratory system is
to bring about the
exchange of oxygen
and carbon dioxide
between the air, the
blood, and the
tissues.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be _______
and _________ before
it reaches the lungs.
______ in the cells
that line the
respiratory system
helps trap any
_________ you inhale
and helps _______ the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be cleaned
and _________ before
it reaches the lungs.
______ in the cells
that line the
respiratory system
helps trap any
_________ you inhale
and helps _______ the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be cleaned
and moistened before
it reaches the lungs.
______ in the cells
that line the
respiratory system
helps trap any
_________ you inhale
and helps _______ the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be cleaned
and moistened before
it reaches the lungs.
Mucus in the cells that
line the respiratory
system helps trap any
_________ you inhale
and helps _______ the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be cleaned
and moistened before
it reaches the lungs.
Mucus in the cells that
line the respiratory
system helps trap any
particles you inhale
and helps _______ the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
Cilia and Mucus
The tissues of the
lungs are very delicate.
Air must be cleaned
and moistened before
it reaches the lungs.
Mucus in the cells that
line the respiratory
system helps trap any
particles you inhale
and helps moisten the
air that travels to the
lungs.
Cilia are hair-like parts of cells.
The respiratory passageways are
lined with cilia. These cilia help
move trapped particles that
were inhaled back up and out of
the body.
The Lungs
Your left lung is a little bit
______ than your right lung
because the heart is taking
up some of that space in
your body.
Below the lungs, there is a
muscle called the
__________. When you
breathe in, the diaphragm
________ to help expand
your ribcage and bring in air.
When the diaphragm
relaxes, you breathe ____.
The Lungs
Your left lung is a little bit
smaller than your right lung
because the heart is taking
up some of that space in
your body.
Below the lungs, there is a
muscle called the
__________. When you
breathe in, the diaphragm
________ to help expand
your ribcage and bring in air.
When the diaphragm
relaxes, you breathe ____.
The Lungs
Your left lung is a little bit
smaller than your right lung
because the heart is taking
up some of that space in
your body.
Below the lungs, there is a
muscle called the
diaphragm. When you
breathe in, the diaphragm
________ to help expand
your ribcage and bring in air.
When the diaphragm
relaxes, you breathe ____.
The Lungs
Your left lung is a little bit
smaller than your right lung
because the heart is taking
up some of that space in
your body.
Below the lungs, there is a
muscle called the
diaphragm. When you
breathe in, the diaphragm
contracts to help expand
your ribcage and bring in air.
When the diaphragm
relaxes, you breathe ____.
The Lungs
Your left lung is a little bit
smaller than your right lung
because the heart is taking
up some of that space in
your body.
Below the lungs, there is a
muscle called the
diaphragm. When you
breathe in, the diaphragm
contracts to help expand
your ribcage and bring in air.
When the diaphragm
relaxes, you breathe out.
How Breathing is Controlled
• Breathing is not completely
voluntary or involuntary
• You can change your breathing
rate almost any time you want, but
you do not have to think about it.
Your brain will make sure that you
keep breathing.
• There are cells in a part of the
brain called the ________
__________ that monitor the
amount of carbon dioxide in the
blood. When carbon dioxide levels
in the blood are high, the medulla
oblongata sends signals through
______ that cause your diaphragm
to contract, making you breathe in.
How Breathing is Controlled
• Breathing is not completely
voluntary or involuntary
• You can change your breathing
rate almost any time you want, but
you do not have to think about it.
Your brain will make sure that you
keep breathing.
• There are cells in a part of the
brain called the medulla oblongata
that monitor the amount of carbon
dioxide in the blood. When carbon
dioxide levels in the blood are
high, the medulla oblongata sends
signals through ______ that cause
your diaphragm to contract,
making you breathe in.
How Breathing is Controlled
• Breathing is not completely
voluntary or involuntary
• You can change your breathing
rate almost any time you want, but
you do not have to think about it.
Your brain will make sure that you
keep breathing.
• There are cells in a part of the
brain called the medulla oblongata
that monitor the amount of carbon
dioxide in the blood. When carbon
dioxide levels in the blood are
high, the medulla oblongata sends
signals through nerves that cause
your diaphragm to contract,
making you breathe in.
Alveoli and Gas Exchange
The _______ are
tiny air sacs in the
lungs. They
increase the
______ ____ of the
lungs to maximize
gas exchange.
Alveoli and Gas Exchange
The alveoli are tiny
air sacs in the
lungs. They
increase the
______ ____ of the
lungs to maximize
gas exchange.
Alveoli and Gas Exchange
The alveoli are tiny
air sacs in the
lungs. They
increase the
surface area of the
lungs to maximize
gas exchange.
RIGHT NOW
• Pick a partner. THIS MUST BE SOMEONE
SITTING NEAR YOU.
• Point to your partner. This is the person you
will make a lung model with
• Start coloring in the diagrams of the
respiratory system while Mrs. Campbell
distributes the lung model materials
• DO NOT TOUCH THE LUNG MODEL
MATERIALS YET