Download The circulatory system

The circulatory
system
By Josh and Jack
Summary
 The
circulatory is made up of the heart,
blood and blood vessels, which service all
of the body’s cells. Oxygen and food
nutrients are exchanged with the waste
that get taken away. There are many
problems in the circulatory system
including heart disease, heart attacks,
high blood pressure, varicose veins,
aneurysms and atherosclerosis.
The systems elements: The heart
 The
heart,
 The heart is a muscly organ that pumps
blood, it is located behind the lungs in
the middle in the thoracic region, about
two thirds of the heart is located to the
body’s lefts side and the other third of it
on the right side. The heart’s base or the
top of the heart connects to the blood
vessels of the body: pulmonary veins, the
aorta, pulmonary trunk and the vena
cava.
The systems elements: Circulatory
loops
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The circulatory loops
You might not know but there are two main circulatory loops
in the human body: the systemic circulation loop and the
pulmonary circulation loop.
The pulmonary circulation loop moves deoxygenated blood
from the right side of the heart to the lungs, the blood picks
up oxygen and returns to the left side of the heart. The pump
chambers in the heart supporting the pulmonary circulation
loop are the right ventricle and the right atrium.
The systemic circulation carries blood with high oxygenation
from the left side of the heart to all of the body tissue in the
body and returns deoxygenated blood to the right side of the
heart. You might be thinking that the pumping chambers for
the systemic circulatory loop are the left atrium and the left
ventricle and if you were thinking that, you were correct.
The systems elements: Blood vessels

Blood vessel are what lets the blood flow quickly and
efficiently from the hear to all the of the regions in the
body and then back to the heart again. The amount of
blood that passes trough the vessels corresponds with
the size of the blood vessel. All of the blood vessels in the
body contain a hollow area called the lumen through
which blood is able to flow through. Around the lumen is
the wall of the vessel which can be thin in case there is
capillaries or it can be very thick in the case of arteries.
All blood vessels have a thin layer of simple squamous
epithelium which keeps the blood cells inside of the
blood vessel and stops c blood clots from happening.
The squamous epithelium lines all of the circulatory
system, all the way to the inside of the heart where it is
called endocardium .
The systems elements: Blood vessels
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The three major types of blood vessels are: capillaries, veins
and arteries. Usually blood vessels will get their name from the
region of the body which they carry blood or close structures.
Arteries are the blood vessels that move blood away from the
heart. Blood that is being carried b arteries is often highly
oxygenated, because of just leaving the lungs and heading
to the body’s tissues. The pulmonary trunk and the arteries of
the pulmonary circulation loop have an exception to this rule
and these arteries carry deoxygenated blood to the lungs
form the heart so it can be oxygenated.
Arteries receive high blood pressures because they carry
blood being pushed from the heart under great force. To
withstand the pressure , the walls of the arteries are thicker,
more elastic, and more muscular than the walls of the other
vessels. The biggest arteries of the body contain a lot of elastic
tissue that allows them to stretch and accommodate the
pressure produced by the heart .
The smaller arteries have a more muscular structure of their
walls. The smooth
Blood
 White
blood cells, blood cells and
platelets floating in a pallid yellow liquid
called plasma. An average adult had five
litres of blood. As well as carrying
substances around your body, blood
helps fight germs, heals wounds and
controls your body temperatures
composition of blood
Plasma
White blood cells and
platelets
Red blood cells
Bibliography
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http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Circul
atory_system
http://www.innerbody.com/anatomy/cardiovascular-male#fulldescription
The Usborne Science Encyclopedia
http://www.ducksters.com/science/blood_and
the_heart.php