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Respiratory System
Function of Respiratory System



Supplies oxygen to the blood and removes
carbon dioxide.
Breathing – fresh air moves into your lungs
and stale air out.
Respiration – chemical reaction that mixes
oxygen with glucose to release energy.
Organs in Respiratory System
Nostrils – hair traps
dust from air.
 Pharynx –
passageway for food
in the esophagus or
air in the trachea.
 Larynx – airway to
which vocal cords are
attached.

Trachea – lined with
mucous and cilia to
trap dust, bacteria,
and pollen.
 Bronchi – carry air to
the lungs
 Bronchioles – clusters
of tiny alveoli.
 Lungs

Breathing

Alveoli are
surrounded
capillaries.

Oxygen and
carbon dioxide
are diffused
through the walls.
See the respiratory system in action!
Inhale





Diaphragm moves down.
Rib cage moves upward.
Increases volume of chest cavity.
Pressure forces air in.
Lungs expand as they fill up with air.
Exhale





Diaphragm moves up.
Rib cage moves downward.
Decreases volume of chest cavity.
Lungs return to position.
Pressure forces air out.
Respiratory Disorders


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Bronchitis – too much mucous in bronchial
tubes.
Emphysema – alveoli are unable to expand
and contract (can’t push air out of the
lungs).
Cancer – tar from cigarette smoke and
other pollutants trigger uncontrolled growth
of cells.
Asthma – an attack is when the bronchial
tubes contract quickly.



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Factoids
Your lungs contain almost 1500 miles of airways
and over 300 million alveoli.
Every minute you breathe in 13 pints of air.
Plants are our partners in breathing. We breathe
in air, use the oxygen in it, and release carbon
dioxide. Plants take in carbon dioxide and release
oxygen. Thank goodness!
People tend to get more colds in the winter
because we're indoors more often and in close
proximity to other people. When people sneeze,
cough and even breathe -- germs go flying!

Why Do I Yawn?
When you are sleepy or drowsy the lungs do
not take enough oxygen from the air. This causes
a shortage of oxygen in our bodies. The brain
senses this shortage of oxygen and sends a
message that causes you to take a deep long
breath---a YAWN.
Why Do I Sneeze?
Sneezing is like a cough in the upper
breathing passages. It is the body's way of
removing an irritant from the sensitive mucous
membranes of the nose. Many things can
irritate the mucous membranes. Dust, pollen,
pepper or even a cold blast of air are just
some of the many things that may cause you to
sneeze.

What Causes Hiccups?
Hiccups are the sudden
movements of the
diaphragm. It is involuntary -- you have no control over
hiccups, as you well know.
There are many causes of
hiccups. The diaphragm
may get irritated, you may
have eaten to fast, or maybe
some substance in the blood
could even have brought on
the hiccups.