Transcript Circulatory system - Pacoima Charter School

Mr. Harper’s science mini lesson
with audio
5th grade Life science
Circulatory system
and
Respiratory system
How blood keeps you alive
Every living thing is made up
of tiny living parts called cells.
Muscle cells
Skin cells
Bone cells
Blood cells
Brain cells
Your body is made
of many billions of
cells. One cell is
too small to see
without a microscope.
Every cell in your body needs
a steady supply of oxygen or
it will die.
Cells must also
get rid of
carbon dioxide
(CO2) or they
will die.
Every cell in your body lives right
next to a tiny blood vessel (tube)
called a capillary.
The blood in our circulatory
system brings oxygen to every
cell through the capillaries and
carries CO2 away.
The walls of these capillaries are
so thin that oxygen and CO2 can
pass easily in and out of the cells.
Oxygen molecules =
Carbon dioxide (CO2) =
capillary
Blood in the capillary
\
cell cell
cell
cell
cell
cell
Your heart, blood,
and the tubes that
carry the blood all
work together as
a system, your
circulatory
system.
The heart is the main organ in
the circulatory system. It’s a
muscle that never gets tired as it
continues to
pump blood
to every part
of your body
every second
you are alive.
Left
atrium
Right
atrium
There are
4 chambers
or sections
in the human
heart.
Right
ventricle
Right
ventricle
Big tubes
called
arteries
and
veins
carry blood
in and out
of the heart.
Arteries carry
blood from the heart
out to all parts of the
body. This blood is
rich with oxygen
which gives it a
bright red color.
In drawings like this,
arteries are
colored red.
Veins carry blood
back to the heart
from all parts of the
body. This blood is
oxygen-poor and is
full of carbon dioxide.
This gives the blood
a purple-brown color.
In drawings veins
are colored blue.
Most drawings
of the
circulatory system
show arteries in red
and veins in blue.
Arteries leading away from the heart
get smaller and smaller as they branch
out through every part of the body.
Arteries get
really small until
they branch into
the smallest
vessels called
capillaries.
Capillary walls are so thin that
oxygen and carbon dioxide (CO2)
can pass right through them in
and out of the body’s cells.
cell
Red blood cells in the blood act like
little buckets that carry oxygen to and
carbon dioxide away from every cell
in your body.
Oxygen and CO2 can only pass between
blood and cells from the tiny capillaries.
There are millions of red blood
cells in every drop of blood.
Every drop of blood has to go through
a capillary to get back to the heart.
Oxygen and CO2 can only pass from blood
to the cells from the tiny capillaries.
artery
Oxygen rich blood
coming from the heart
Capillaries connecting
arteries to veins
Oxygen poor blood
going back to the heart
vein
At the end of the capillary, blood goes
into a vein. The veins leading back to the
heart get bigger and bigger as they
branch together.
Used blood going
back to the heart
veins
The blood returning to the heart
in the veins is full of poisonous
carbon dioxide (CO2).
To the
lungs
Next, the heart
pumps this blood
to the lungs
where CO2 is
exchanged for
fresh oxygen.
Lungs are the main organs in the…
respiratory system
respiratory system
The respiratory system brings
oxygen into your blood and
gets CO2 out.
When you breath in, your lungs
pull air containing oxygen into
your body.
oxygen
Lungs
When you breath out, your
lungs push air containing
CO2 (carbon dioxide)
out of your body.
CO2
Lungs
Air travels
from the nose
and mouth
to the lungs
through a tube
called the
trachea
or windpipe.
(TRAY kee uh)
The trachea
branches
into the
bronchi
to go into
each lung.
Bronchi (rhymes with donkey)
is the plural for bronchus
1 bronchus
2 bronchi
The bronchi
branch smaller
and smaller as
they carry air to
millions of tiny
air sacs in the
lungs.
lung
heart
Air sac
You have millions of air sacs in your lungs.
They are much smaller than shown here.
The blood
coming to
the lungs
from the heart
is full of CO2.
The blood
vessels branch
smaller and
smaller into
capillaries that
surround the
air sacs.
Air sacs are so
thin that oxygen
and CO2 can
pass right
through them
to go in and out
of the capillaries.
The red blood cells get rid of the CO2
they are carrying and fill up with fresh
oxygen as they pass through the
capillaries around the air sacs.
When the blood
leaves the lungs,
it is full of oxygen
and bright red
again. The blood
goes back to the
heart to be
pumped out and
take oxygen to all
parts of the body.
Oxygen rich blood going
out to the upper body
Oxygen
rich
blood
from
lungs
Oxygen rich blood going
out to the lower body
Oxygen rich blood going
out to the upper body
For as long as
you live, your
blood will continue
to “circle” around your
circulatory system and
through your lungs to
bring your cells what
they need to live.
Oxygen
rich
blood
from
lungs
Oxygen rich blood going
out to the lower body
Now, let’s review
the important
information to
find out how
much you
remembered.
Let’s Review:
What is the most important organ
in the circulatory system?
The heart is the most
important organ in the
circulatory system.
Let’s Review:
How many chambers does the
heart have?
Let’s Review:
A human heart has
4 chambers.
3
1
4
2
Let’s Review:
What are the vessels that carry
oxygen-rich blood from the heart
out to every cell in your body?
Let’s Review:
Arteries are the
vessels that carry
oxygen-rich blood
from the heart out to
every cell your body.
Let’s Review:
What are the vessels that carry
oxygen-poor blood from the cells
back to the heart?
Let’s Review:
Veins are the
vessels that carry
oxygen-poor blood
from the cells back
to the heart.
Let’s Review:
What are the tiny vessels that
connect arteries to veins?
Let’s Review:
Capillaries are the tiny vessels
that connect arteries to veins.
Let’s Review:
What important activity happens
only around the capillaries?
Let’s Review:
Your body’s cells get oxygen and
get rid of CO2 only from the
capillaries. This is called gas exchange.
Let’s Review:
Where does blood go after it
returns to the heart from the cells?
Let’s Review:
The heart immediately pumps the
CO2 filled blood from the cells to the
lungs.
Let’s Review:
What happens to blood when
it goes through the lungs?
The blood exchanges gases
(gets rid of CO2 and fills up with oxygen)
when it goes through the lungs,
Let’s Review:
What is in blood that acts like tiny
buckets to carry oxygen and CO2?
Red blood cells
act like little buckets that carry
oxygen and CO2 in the blood.
To learn more about the
body systems that keep you
alive, check out these
Brainpop cartoons:
•
•
•
•
Circulatory system
Respiratory system
Heart
Blood