Transcript The Respiratory System - science

The Respiratory System
Explain the Function of the
Respiratory System
Explain the Function of the
Respiratory System
To supply the blood with oxygen
in order for the blood to deliver oxygen to
all parts of the body
It is the system of the body that deals with
breathing
Click here for an interactive
diagram of the structures &
functions of the respiratory
system:
http://www.lungusa.org/learn/resp_sys.html
What is the pathway oxygen
takes through the body?
What is the pathway oxygen takes
through the body?
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Nose & mouth
Pharynx
Trachea
Bronchi
Bronchioles
Alveoli
Capillaries
Explain gas exchange in the
lungs
Explain gas exchange in the lungs
• Oxygen in the lungs diffuses through the
alveoli, through the capillary wall, and into
the blood
• Carbon dioxide in the blood diffuses
through the capillary wall and into the
alveoli
Explain gas exchange in the lungs
This animation was
taken from:
http://www.le.ac.uk/pat
hology/teach/va/anato
my/case2/2_2.html
Click the link to read
more about gas
exchange
What causes breathing?
What causes breathing?
• Inhalation
– Rib muscles contract to pull ribs up and out
– The DIAPHRAGM muscle contracts to pull
down the lungs
– Tissue expands to pull in air.
• Exhalation
– Rib muscles relax
– The Diaphragm muscle relaxes
– Tissue returns to resting position and pushes
air out.