Transcript File

DO NOW: Describe what you think
happens when you are choking.
Aim : What is the Respiratory
System and why is it important
for maintaining Homeostasis?
What is the respiratory system?
• The respiratory system has 2 main
functions:
–Take in OXYGEN from the outside
(INHALE)
–To get rid of CARBON DIOXIDE from
the inside (EXHALE)
The parts of the respiratory
system
• The respiratory
system extends from
the head to the
chest.
• It begins in the head
where air enters and
exits through the
nose and mouth.
The parts of the respiratory system
(continued 1)
• Once the air passes
through the mouth,
it enters the
pharynx (the back
of the throat).
• Once passed the
pharynx, the air
enter a rigid (stiff)
tube called the
trachea.
The parts of the respiratory system
(continued 2)
• The trachea is made up of
cartilage which makes it stiff.
•
• The trachea is lined with cilia
and mucus. This helps to
keep foreign material out of
the lung.
• Foreign material sticks to the
mucus and the cilia pushes
the material up into your
pharynx where you can
cough it up or swallow it.
The parts of the respiratory system
(continued)
• At the end of the
trachea, it slips into two
separate smaller tubes
called the bronchi
• The bronchi enters a
soft, sponge organ
called the lungs
The parts of the respiratory system
(continued 3)
• Once in the lungs, the
bronchi further reduce (get
smaller) and branch into
Bronchioles.
• At the end of the
bronchioles there are a
cluster of sacks called
alveoli.
• The alveoli is the place
where gas exchange
occurs.
The alveoli
• The alveoli is a thin walled
chamber that is surrounded
by capillaries.
Alveoli
• This is where gases exchange
from outside the body to the
inside the body and vise
Deoxygenated
versa.
blood side
• This process is possible
because of the different
concentration of gases inside
and outside the body.
Capillary
CO
O2 2
diffuses
diffuses
into the
into the
alveoli
red blood
cell
Oxygenated
blood side
How do we breathe?
• The lungs do not have
muscles.
• The lungs are enclosed in a
vacuumed chamber (cavity)
• The diaphragm is a
muscular membrane the
contracts and expand
causing the cavity it enlarge
and shrink , which makes
the lungs inhale and exhale.
http://www.youtube.com/watch?v=NaZvufXwng&feature=related
http://www.youtube.com/watch?v=f2G6_otEto4&feature=related
One way in, one way out
• Because the respiratory system only has one
entrance and exit point, anything blocking the
pathway will interrupt gas exchange (choke).
• Since oxygen cannot reach the alveoli, no
oxygen can go into the blood.
• If no oxygen gets into the blood, the body cell
will not be able to perform cellular respiration
in the cells.
What happens when we exercise?
• When you exercise, your body
work more.
• Because your body is working
harder, it needs more energy.
• Because the body needs oxygen
to break down glucose for
energy (respiration), you start to
breath faster.
• Because you need the oxygen
fast, your heart pumps faster.
What happens when we exercise?
(contiuned 2)
• As the glucose is converted into
energy, Carbon Dioxide is
released.
• This carbon dioxide is diffused
into the blood.
• The blood brings the carbon
Dioxide to the lungs.
• The carbon dioxide is expelled as
you exhale
Pharnyx
Mouth
Trachea
Bronchi
Bronchiole
Alveoli