00:01
So now let's look at
the functional anatomy of
the respiratory system.
00:06
So starting with
the upper portion
or the upper respiratory tract.
00:11
We have three major organs.
00:14
We have our nose
and nasal cavity
which are important
for warming of air,
moistening of air as well
as filtering incoming air.
00:24
We also use our nose
and nasal cavity
for detecting odor or olfaction,
and believe it or not
we also use it for
modifying our speech.
00:35
For example,
when I talk like this,
my airways are nice and open.
00:40
However what I pinch my nose
that changes the way
by voice comes out.
00:47
Along with this we also
have our paranasal sinuses.
00:51
There are four sets
of paranasal sinuses
found in the bones.
00:56
We have our maxillary
which are under the eyes
the frontal which
are above the eyes
the ethmoidal which
are between the eyes
and the sphenoidal which
are behind the eyes.
01:07
The function of these
sinuses is to drain mucus
into the nasal cavity
and also serve as resonating
chambers for sound.
01:16
So if you've ever had
a sinus infection,
you might notice
that your voice sounds a
little different as well.
01:22
This is for the same reason
because it's all a
part of this chamber
that allows for air
and sound to come out.
01:30
The third structure of the
upper respiratory system
is the pharynx.
01:34
We call this the throat.
01:37
The pharynx is divided into
three different sections,
the nasopharynx,
which is the part
behind the nasal cavity,
the oral pharynx,
which is the part
behind the oral cavity
and the laryngopharynx,
the part that is going to
be connected to the larynx.
01:53
The pharynx serves as
a passageway for air
and also a resonating
chamber for sound
and also has some immune
functions such as the tonsils.
02:06
Now, let's move to the
lower respiratory tract.
02:10
The lower respiratory tract
has four main components.
02:14
We have the larynx,
the trachea,
the bronchi and branches,
and the lungs and the alveoli.