Circulatory Syatem Essay

This essay has a total of 1178 words and 5 pages.

Circulatory Syatem

Circulatory System
A simple definition for the circulatory system would be that it is the main transportation
and cooling system for the body. Red Blood Cells have an important job in this system in
that they carry all sorts of packages that are needed by all the cells in the body. Red
blood cells carry oxygen and nutrients to the cells, which is needed in order for cells to
survive. Besides red blood cells there are also White Blood Cells moving in the
circulatory system. White Blood Cells can be considered as the paramedics, police and
street cleaners of the circulatory system. Anytime we have a cold, a cut, or an infection
the white blood cells go to work. From research I also came to find out that white blood
cells also help cuts or wounds to heal quicker. Something I did not know was that puss
which appears during an infection are actually white blood cells that are attacking the
infection.

The highway system of the Circulatory System consists off a lot of one-way streets. The
main routes used by the circulatory system are the veins and arteries. Veins are used to
carry blood to the heart. Arteries then carry blood away from the heart. Most of the time,
blood in the veins is blood where most of the oxygen and nutrients have already been
delivered to the cells. This blood is called deoxygenated and is very dark red. Most of
the time blood in the arteries is loaded with oxygen and nutrients and the color is very
bright red. There is one artery that carries deoxygenated blood and there are some veins
that carry oxygenated blood. In order to get more research on this I had to look up some
information on the heart and lungs.

The heart is not hard to imagine in ones mind because it is simply a two sided, four
chambered pump. The heart is mostly made of muscle and is very unique because it is the
only muscle that does not become tired like other muscles. . Imagine what would happen if
every 15 minutes or so ones heart becomes tired and decides to take a little break! If
this were to happen it basically means that in a few moments ones circulatory system will
shut down since the heart is the powerhouse of this system. Since it never rest, the heart
muscle is always expanding and contracting, usually at between 60 and 100 beats per
minute.

Since the heart is divided into two sections this means that each section has a specific
job. The right side of the heart is the low-pressure side. Its main job is to push the red
blood cells up to the lungs so that they can get recharged with oxygen. Blood enters the
right side of the heart through a chamber called the Right Atrium. Atrium is another word
for an 'entry room.' Since the right atrium is located above the Right Ventricle, a
combination of gravity and an easy squeeze pushes the blood though the Tricuspid Valve
into the right ventricle. The tricuspid valve is a valve made up of three 'leaflets' that
allows blood to go from top to bottom in the heart but closes to prevent the blood from
backing up into the right atrium when the right ventricle squeezes. After the blood is in
the right ventricle, the right ventricle begins its contraction to push the blood out
toward the lungs. The blood then leaves the right ventricle and enters the pulmonary
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