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The circulatory system By Josh and Jack Picture Source: www.ceufast.comwww.ceufast.com.

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1 The circulatory system By Josh and Jack Picture Source: www.ceufast.comwww.ceufast.com

2 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.

3 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.

4 The systems elements: Circulatory loops  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.

5 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.

6 The systems elements: Blood vessels  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

7 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

8 Bibliography  http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Circul atory_system http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Circul atory_system  http://www.innerbody.com/anatomy/cardiovascular-male#full- description http://www.innerbody.com/anatomy/cardiovascular-male#full- description  The Usborne Science Encyclopedia  http://www.ducksters.com/science/blood_and the_heart.php http://www.ducksters.com/science/blood_and the_heart.php


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