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OBESITY & THE CARDIOVASCULAR SYSTEM The main function of the cardiovascular/circulatory system is to continuously pump blood around the body. It consists of the heart, arteries, veins and the capillary network of arterioles and venules. The capillary network is vast consisting of 62,000 miles of blood vessels. Any blockages in cardiovascular system can be very dangerous to our health, even fatal. The heart, the body's pump, has 2 compartments separated by a septum. Each compartment contains 2 chambers, atrium and ventricle. The right side pumps de-oxygenated blood to the lungs (pulmonary circulation) and left side oxygenated blood to all other organs and tissues (systemic circulation). The heart is made up of a special kind of muscle - myogenic/cardiac muscle which contract automatically and rhythmically. The diagram below shows compartments of the heart in more detail. Blood used by the body returns through the veins to the right compartment (pulmonary circulation) of the heart via the...

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