|I am studying the humans heart I found
interesting information in books, but I don't read
in English too well yet. I found a page in the
Internet that told me the names of the parts of
the human heart . I don't have a lot of
information but I hope you could help me.
Your body is made up of many, many cells, all of
which need oxygen to survive. When the cells use
oxygen they produce a waste product called carbon
dioxide that then must be removed from your body
or it will poison the cells. The only way your
body can get oxygen or remove carbon dioxide is
from the air which enters and leaves your lungs
when you breathe. The heart's main function is to
move blood from the lungs, where the oxygen enters
your blood, to every other part of the body that
needs the oxygen. The blood also carries carbon
dioxide from the cells to the lungs where you then
breathe the carbon dioxide out.
is basically a big muscle wrapped around four
compartments. Two of those compartment are
responsible for directing the flow of the
high-oxygen blood from the lungs toward the rest
of the body. The other two compartments are
responsible for returning the blood that has
already delivered its oxygen back to the lungs so
that it can get more oxygen and get rid of carbon
dioxide that has built up. When you hold your
breath, after a while your blood runs out of
oxygen and your brain sends a message to your
lungs that you need to take a breath. What
triggers your brain to send that message is the
high level of carbon dioxide in your blood, not
the low level of oxygen!
compartments in the heart are called the left
ventricle, the right ventricle, the left atrium
and the right atrium. The left atrium and the left
ventricle (the atrium is on top, the ventricle is
on bottom) pump high-oxygen blood from the lungs
which is delivered to the rest of the body by the
arteries. The right atrium and the right ventricle
pump low-oxygen, high-carbon dioxide blood from
the body to back to the lungs by way of the veins.
Low-oxygen blood is blue while high-oxygen blood
is red, so the blue
veins you see under your
skin are blood that is returing to the heart to
pick up more blood (the red arteries are usually
too deep to be seen though the skin). When you cut
yourself, that blue blood turns red again when it
comes into contact with air and picks up
Blood only flows in one direction
though the four different chambers of the heart
(in or out) because valves prevent backwards flow.
Why do you think this is? Human hearts have a
natural pacemaker that sets the speed at which the
heart beats. When your body releases certain
chemicals, the pacemaker will speed up or slow
down your heartbeat. Why would you want your heart
to be able to change the speed at which it pumps
(faster or slower)?
It sounds like you already have a good idea about
how to find out about things by using the
Internet. The human heart is actually a big muscle
that works very hard, all of the time. It would be
interesting for you to find out how many times a
human heart beats in a day, a week, a month and a
year. You can do this by looking up treh
information OR you can do your own calculation by
monitoring your own heartbeat! Also, I bet that
you can find out how much blood a human heart
pumps in a day. It is a big job! Another good
project might be to explain why smoking or eating
fatty foods is bad for your heart. You can learn
about how the heart develops by visiting a website
on Developmental Biology and then linking to other
sites from there. The website address is:
Have fun learning
about the heart!
One way to understand how the heart works is to
put a bit of water in a balloon. Don't use a lot
of water. Now squeeze one end. What happens to
the water? This is how your heart works. It is
like having two balloons side-by-side, plus tubes
that come in and go out carrying blood, and
one-way doors to keep blood from backing up. The
basic idea is the same though. The heart is
really two side-by-side pumps. Blood comes into
the top places (left and righ atria). Then the
heart (which is a big muscle) squeezes the blood
into the bottom spaces (ventricles). Then the
ventricles squeeze the blood out to the arteries.
Where does the blood go from there?
are nice articles on the heart
Here are some good websites with lots of pictures
to help you learn about the heart through
last site has lots of nice pictures, and lots of
links at the bottom of the page that lead to even
more good, labelled pictures of the heart.
Concentrate on the pictures and try reading what
you can. Write me back if you have more specific
questions or to tell me your answer to this
Why do we need a heart?
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