Project by Tyson, Natori, and Emily.
What is the circulatory system
and what does it do?
The circulatory system, also called the
cardiovascular system, is a vital organ system in the
human body composed of the heart, blood, and blood
vessels.
This body system circulates blood throughout the
body. Blood carries red blood cells, which carry
oxygen, and oxygen is needed for the body to
survive. White blood cells are also carried by blood
but white blood cells fight bacteria. This places them
in the immune system.
Also, the blood carries nutrients for the body.
Nutrients help the body live and grow.
The heart
The heart is considered what the
system centers around even if each
of the parts of the circulatory
The
Parts
of
the
circulatory
system
system all play a huge part in
oxygenating the body.
The heart is about the size of
your fist and it’s the strongest part
of your body. It is a very muscular
organ with valves so there is only
one-way blood flow. The heart
squeezes repetitively to “pump”
blood through your blood vessels. The human heart
Blood
Blood is a big part of the circulatory system. It is a liquid
that transports important things around the body like
oxygen and nutrients. The name “circulatory” comes from
the fact the the system circulates blood through the body.
The main components of blood are plasma, white blood
cells, and red blood cells.
Plasma is a liquid and it’s the reason that blood flows.
Plasma also carries nutrients and white blood cells. Red
blood cells carry oxygen, then go to the lungs to get oxygen
and then go somewhere to use it. White blood cells protect
the body from bad bacteria and viruses.
This picture is of red blood cells. Plasma is the liquid they are in.
Blood vessels
Blood vessels carry blood to and from the heart. Thickwalled arteries carry oxygen filled blood from the heart
and veins take the oxygen-depleted blood back. Arteries
have muscles to move blood through your body and veins
have valves that keep blood from going the wrong
direction.
Capillaries are blood vessels so tiny that the red blood
cells have to line up single file to pass through. Capillaries
do not push the blood itself, but the blood is pushed by
pressure behind it.
Blood vessels.
Oxygen-depleted blood is not
blue, but is a darker red. It
often show up blue through
your skin. Visuals like this use
blue for contrast.
If the body needs oxygen to function
and move, so if you were moving more,
you would probably need more oxygen.
So your heart would pump harder to get
you more, right?
Let’s test that.
People who didn’t
volunteer: Sit down, count
your pulse (15 seconds) ,
don’t get in anyone’s way,
and try not to laugh too
hard.
Those who volunteered:
Do jumping jacks until the
timer rings. (15 seconds.)
Then count your pulse for
15 seconds.
We will set a timer 15 seconds
twice. The first time, nonvolunteers count. Then volunteers
exercise. The second 15 seconds,
volunteers count.
What was your result?
Basically, everyone should get a different
number of beats per minute. Heart rate can be
changed by height, muscle mass, fitness, food,
medication, and endless other factors.
Generally, those who did the exercise should
have gotten higher heart rates. Usually fitter people
get lower BPMs, but as earlier stated, another
factor can easily affect that.
Answer these questions: (1-3 sentences would
do)
1. What was your result in BPM?
2. Why do you think you got that result?
3. What do you think the circulatory system’s
most important part is? Blood or the heart?
Bibliography
http://www.innerbody.com/image/cardov.html
http://learn.fi.edu/learn/heart/vessels/vessels.ht
ml
Google images
We hope you liked our presentation!