Download Cardiovascular Unit Day 1

Bell Ringer (Day 1)
Write these in your notebook and save them to be turned
in with your test.
Students will be able to explain the purposes of arteries,
veins, and capillaries.
Students will be able to describe the path of deoxygenated
blood to oxygenated blood.
Students will be able to identify the different parts of a
human heart.
Students will be able to describe problems that affect the
cardiovascular system
Students will be able to list risk factors related to heart
disease that are within a person’s control
Students will be able to list many different cardiovascular
diseases
Cardiovascular System
Definition
The cardiovascular system is made up of
your heart, blood, and a network of
branching blood vessels.
How Body Cells Work Video Clip
Heart
Your heart is really a muscle. It's located a little to
the left of the middle of your chest, and it's about
the size of your fist.
This amazing muscle pumps 4300 gallons of
blood a day.
The heart sends blood around your body.
This blood provides your body with the oxygen
and nutrients it needs. It also carries away the
waste that your body has to get rid of.
Heart cont’d
Your heart is sort of like a pump, or two pumps in
one. The right side of your heart receives blood
from the body and pumps it to the lungs. The left
side of the heart does the exact opposite: it
receives blood from the lungs and pumps it out to
the body.
By the time you're grown up, your heart
will be beating (pumping) about 70 times
a minute.
The Heart
Heart Parts
The heart is made up of four different areas, called
a chambers.
There are two chambers on each side of the heart:
one chamber is on the top, and one chamber is on
the bottom.
The two chambers on top are called the atria, but
if you are only talking about one, then say atrium.
The atria are the chambers that fill with blood.
Heart Parts
The two chambers on the
bottom are called the ventricles.
Their job is to squirt out the blood.
Running down the middle of the heart is a
thick wall of muscle called the septum. The
septum's job is to separate the left side and
the right side of the heart.
Heart Chambers
Heart Valves
When the blood gets pumped in, it relies on four
special valves inside the heart to get directed out
Two of the heart valves are the mitral valve and
the tricuspid valve, and they work between the
atria and ventricles.
The other two are called the aortic valve and
pulmonary valve, and they're in charge of
controlling the flow as the blood leaves the heart.
Heart Valves
Activity
1- Find your pulse
2- Count the beats for one minute
3- Calculate how many times your heart
beats in a day, week, month & year.
4- How many times has your heart beaten
since you were born?
(Do the math on paper if no calculator!!)
Hmmmmm……
Can blood be blue?
Is there really blue blood?
What do you think?
Why Does Blood Appear Blue?
A vein looks blue because red light travels far enough
into the skin to be absorbed by the blood in the vein. If
the blood vessel is far enough below the skin, however,
blue light--which would normally also be absorbed by
the vein--reflects out of the skin before reaching the
vein. So the light reflecting from tissue over the vein
contains less red light than blue, giving the vein a bluish
cast.
For a vein to look blue, it has to be at least .02 inch
below the surface, which explains why fair-skinned
people look pink and not blue when they blush. The
small surface capillaries that become engorged during
blushing lie just a thousandth of an inch below the skin's
surface. Past about .08 inch, light can't penetrate, and
blood courses unseen.
The End!!