--is a life process common to both plants
-- In this Process, there is an
exchange and carbon dioxide.
-- In our body, oxygen continuously
supplied to your body cell and is
transported through your bloodstream.
-- is then used to oxidize
or “burn” food materials in
every living cell.
-- After cellular breakdown
of food, carbon dioxide is
released by cell.
-- This gaseous waste is again
picked up by your blood and is
expelled from your body system.
1. Oxidation of food by living cell.
2. Transport of oxygen to the cells and the removal of carbon
dioxide from lungs.
3. Exchange of gases between your blood and lungs.
4. The breathing process.
System allows the
exchange of gases to
occur with two
-- is the
the blood. This
-- is the exchange
of gases between
the blood and the
body tissues. It
occurs in every
-- In External respiration,
oxygen from the air goes
into your lungs through
the respiration tract. In
your lung capillaries,
oxygen joins your blood.
At this point, the level of
oxygen is higher in the
alveoli of your lungs.
The blood that leaves your lungs is
called oxygenated blood. The blood
entering your lungs is said to be
♫ is a mechanical process that helps get air
in and out of the lungs.
♫ it consist of two stages :
♪ Life depends on breathing because the body cells need
♪ Oxygen is one of the mixtures of gases found in air
♪ During inspiration, you breath in or inhale to bring fresh
supply of air into your lungs.
♪ During expiration, you breathe out or exhale to get rid
carbon dioxide or waste gases not needed by your body.
♪ They are then expelled to relieve your body cells of
Infants – 30 to 40 times a minute.
Six years old – about to slows down 22 times a
Your age until your about 25 – further slowed
down about 16 to 18 times a minute.
- An exception when
you are an athlete or
when you engage a hard
- Your Breathing rate
such cases will be
a. Air enters to your nose. The nostril serve as entrance to your nasal cavities. They are a pair of passage separated by a
b. Inside the right and left nasal cavities are coarse hairs that filter the air and trap any microorganism or dust
T H E L U N G S
∞ Your Lungs occupy twin cavities,
one at each side of the chest.
∞ They separated by your heart,
blood vessels, and your
∞ Each of Lungs is large enough to
fill the pleural division of the
∞It is cone-shaped with its base
pointing downward, resting on the
diaphragm, or sheet of muscle,
∞The top, or apices, on the other
hand, bulge upward.
Your left lung is slightly smaller
than your right.
It has two main division or lobes
while the right lung has three.
Your lungs are
spongy and are covered
by a double pleural
The mucus acts as a
the lungs to move
freely in the chest
Your lungs fit into a
box-like space. At the
is a process by which waste materials from
the oxidation of food cell in cell metabolism
are removed from living cells.
Carbohydrates breakdown produce
carbon dioxide and water as its waste
These are removed from the body through
the lungs during expiration
Other excretory organ which you have
already studied are you liver which forms urea
-- Your skin which
salts and urea in
the form of sweat.
-- Your Large
-- is a nitrogenous waste
substances found chiefly in the
-- another nitrogenous waste products of cell activity, is
insoluble and is mainly found among land animals.
The excretory process ---
Its parts and function
lower forms of animals, especially one-celled organisms, expel their cells waste products directly into their
In some protozoan's, excretory processes occur almost similarly.
Euglena expels food materials through the cell membrane.
Amoeba retains undigested food particles in a vacuole and later passes them out at any point in its ccell