The Circulatory System Essay -- Papers

The Circulatory System The circulatory organisation is one of the nearly important systems in the human personify. It consists of the heart and argumentation vessels. It is what makes the cable in our body go round. The blood carries type O, nutrients and hormones and takes them to where they are needed and removes the deplete products kindred carbon dioxide. The circulatory system nourishes either cell, tissue, organ and organ system in the body. There are approximately ten pints of blood perpetually circulating through seventy- five- thousand miles of blood vessels. These blood vessels reach every cell in the human body. Once they reach the cells they deliver practically needed oxygen and remove carbon dioxide and other poisonous waste products. The circulation to and from the lungs is called the pulmonary circulation the circulation round the rest of the body is called the systemic circulation. On average, a red cell would go round the whole circulation in 45 seconds. Our blood is pumped to two places the right side of the heart pumps blood to the lungs, and the left side of the heart has to work harder pumping blood to the rest of the body which is why the left side of the heart is bigger and more healthy than the right side. Blood is pumped from the heart to the lungs and because travels back to the heart, where it is then pumped to the body. To get all the way round the circulation, blood has to go through the heart twice and this is why it is known as a double circulation. Blood is carried round all parts of the body by small tubes called blood vessels. The human Circulatory system is composed of leash types of vessels arteries, veins and capil... ...ood and waste products back to the heart. The blood in the veins moves s let outly due to low pressure. Semi-lunar valves are found at regular intervals throughout the veins. These force the blood to move in only one direction. The vein s walls are thinner, wider, little springy and less muscular than those of the arteries. The veins are compressed when body muscles, particularly in the limbs, move so the valves in the veins have to prevent the blood satiny backwards. The blood in most veins is deoxygenated and applys more carbon dioxide but less food than the blood in most arteries. This is because respiring cells have used the oxygen and food and produced carbon dioxide. The pulmonary veins, which return blood from the lungs to the heart, are an exception. They contain oxygenated blood and reduced level of carbon dioxide.