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systems for survival.

by Albert Ryan

Albert Ryan

on 24 March 2011

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Transcript of systems for survival.

systems for survival An overview of the circulatory system The circulatory system is a system composing of the heart,veins and ateries. There is a 'loop' going from the heart to the lungs and then back to the heart. The other 'loop' goes from the heart to the rest of the body through the ateries and then back to the heart through the viens. M.R.S G.R.E.N Table the cirlculatory system A diagram of the circulatory system the arteries (red) the heart the veins (blue) http://www.123rf.com/photo_3196852_cardiovascular-system.html the Heart The heart is the main organ of the circulatory system, it pumps all the blood in your body through the arteries and then the veins.It has 2 halves, the left and right side. The left side is a lot bigger than the right because it needs more muscle to pump at a higher presure to pump blood to the whole body. The right side only needs to pump blood to the lungs via the pulmonary artery (the only artery that carries deoxygenated blood). Both the left and right sides have a atrium (which recieves the blood from the vena cava's or the plumonary veins) and a ventricle, which is bigger than the atrium and where the main muscle contractions take place.
The 'beating sound' you hear from the heart is actually the vaulves opening and shutting. the veins The veins are blood vessles that carry blood back towards the heart. Most veins carry deoxygenated blood except for the plumonary veins (they carry blood from the lungs to the heart). Veins are usually closer to the surface than arteries and 60% of blood is carried in the veins. Your veins are actually a dark red because the blood has most of the oxygen has been taken from it ( most people mistakenly believe that the blood in the viens are blue, this is actually a trick of the light because the fat surrounding the viens absorb most light allowing only blue to pass out). the Arteries The arteries are blood vessles that carry oxygenated blood away from the heart (except for the plumonary artery, which carries deoxygenated blood from the heart to the lungs). Arteries carry high pressure blood pumped from the heart, this is where you can mesure blood pressure from. Arteies are also bigger and fewer than veins. It can be dangerous to sever a main artery, if left untreated a severed leg artery can kill you in around 5 minutes.All the blood in the arteries is coloured red except the plumonarey atery. http://www.chacha.com/question/how-long-does-it-take-to-bleed-out-from-a-severed-leg-artery http://en.wikipedia.org/wiki/Arteries http://en.wikipedia.org/wiki/Heart http://en.wikipedia.org/wiki/Veins Heart Disease In U.S.A heart disease acounts for 25% of all deaths. http://lvhealthmag.com/wp-content/uploads/2011/02/shutterstock_27705175.jpg http://en.wikipedia.org/wiki/Coronary_heart_disease Heart disease is a very common problem in western society. Heart disease is actually a general term for diseases affecting the heart a few of the main ones are coronary heart disease- failure to supply enough circulatoin to the heart and related areas.
Cardiomyopathy- deterioration of the heart muscles.
Heart failure- heart fails to pump enough blood around the body, causing ohter parts of the body to fail.
Valvulvar heart disease- failure of one or more of 4 main the vaulves in the heart.
inflammatory heart disease- the inflammation of the heart muscles. http://en.wikipedia.org/wiki/Heart_disease Most forms of heart disease are afected by lifestyle and society, although a few conditions are passed down geneticly. You can help prevent some lifestyle types of heart disease by eating healthily, exercising and not to become to stressed. For heart diseases not so preventable thier is a wide range of drugs to help with coping with heart disease. As a last resort you can sign up for a heart transplant, but the waiting list is long and donors are in short supply. Bibliography sorry that I didn't have any books Goodbye!
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