The Respiratory System
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Mrs. Hasson
Ms. Golden
Mrs. Lattanzio
Mrs. Hopkins
7th Science
The Respiratory System
• The purpose of the
Respiratory System is
to bring needed Oxygen
to the cells and remove
the waste product
Carbon Dioxide!
• Remember: The cells
use Oxygen to release
energy from food in a
process called Cellular
Respiration. Carbon
Dioxide and water are
the waste created
during this process.
Where Does the Respiratory System
Begin?
• The respiratory system
begins at the nose and
nasal cavity. The nose
and nasal cavity are
lined with small hairs
called cilia, capillaries
and mucus. These 3
items help to warm,
moisten, and clean the
air before it enters the
lungs.
The Trachea
• The trachea is the
cartilage lined tube that
travels down the neck,
after your voice box, or
larynx. It will branch
before it gets to the
lungs. The cartilage
gives it support, helping
it to remain open. Feel
your neck, the bumps you
feel are the cartilage
rings.
The Branches or Bronchioles
• The Trachea branch
into the bronchi and
then the
bronchioles. If you
look carefully it
appears to look like
an upside-down tree.
Tiny little air sacs!
• At the end of the
bronchioles are millions
of tiny little air sacs or
alveoli. These alveoli are
where gas exchange takes
place! They are covered
with tiny blood vessels
called capillaries.
• If you recall, capillaries
are the blood vessels
where gas exchange or
diffusion takes place!
Oxygen in and Carbon Dioxide
out!
• At the alveoli,
oxygen will go into
the capillaries, being
picked up by the Red
Blood Cells. The
blood will then
release the Carbon
Dioxide into the
alveoli, where it will
be exhaled into the
atmosphere!
Inhalation and Exhalation!
• The diaphragm is a
smooth muscle that
controls the movement of
the lungs. When the
diaphragm contracts, it
pulls down, causing the
chest to expand and the
air to rush into the lungs.
When it relaxes, the chest
becomes smaller and air
is exhaled.
Relax and contract!
• Remember:
– When the diaphragm
contracts, or pulls down,
air rushes into the lungs!
– When the diaphragm
relaxes or bowls upward
the chest relaxes and the
air rushes out of the
lungs expelling waste!
Very Short VIDEO on the Respiratory System!
http://www.neok12.com/php/watch.php?v=zX7a51620305036844477802&t=Respiratory-System
Why do we need oxygen? Cellular
Respiration!
• Remember: The cell is
taking in Oxygen and
nutrients. It releases
energy from the nutrients
using the oxygen. Carbon
dioxide is the waste
product produced. We
need to get rid of that
waste. The gases that are
exchanges is Oxygen and
Carbon Dioxide!