Download Respiratory System

Respiratory
System
Respiratory System
Respiratory System
What are some of the organs and
what is the function of our
respiratory system?
Respiratory System
 Organs include:
 larynx (voice box)
 trachea (wind pipe)
 bronchial tubes
 lungs
 alveoli
 diaphragm
Respiratory System
 Functions include:
 Supplying oxygen we
inhale to the blood
 Removing carbon
dioxide we exhale
from the blood
Respiratory System
Air travels from the mouth or
nose through your larynx
(voice box), down your
trachea (wind pipe), and then
into the bronchial tubes that
enter your lungs.
Respiratory System
Inside your lungs, at
the ends of the bronchial tube
branches, there are millions
of alveoli. These little sacs
are where gas exchange
occurs. Small capillaries
are picking up oxygen and
dropping off
carbon dioxide.
Respiratory System
The diaphragm is made of smooth
muscle. It contracts & relaxes to
help the lungs inhale & exhale.
If you inhale deeply, you can feel
the diaphragm contracting. When
you exhale, you can feel it relaxing.
How do you Breathe?
When you inhale, the diaphragm contracts, causing the chest
cavity to expand. This expansion lowers the pressure in the chest
cavity below the outside air pressure. Air then flows in through the
airways (from high pressure to low pressure) and inflates the
lungs.
When you exhale, the diaphragm muscle relaxes and the chest
cavity gets smaller. The decrease in volume of the cavity increases
the pressure in the chest cavity above the outside air pressure.
Air from the lungs (high pressure) then flows out of the airways to
the outside air (low pressure). The cycle then repeats with each
breath.
How do you Breathe?
Lung Trivia
 Each lung is about the size of a football.
 The lungs fill the area from the collarbone to the
bottom of the ribs.
 Lungs are the only organ in the body light
enough to float.
 There are 300-500 million alveoli having a total
surface area of about a tennis court in an adult.
 If all the capillaries that surround the alveoli
were unwound and laid end to end they would
extend 997.79 kilometers (620 miles).