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There are four valves in the heart which prevent blood from flowing backwards. The positions of the heart valves are:between the right atrium and ventriclebetween the left atrium an dventricleat the entrance to the pulmonary arteryat the entrance to the aortaThe muscular wall of the left ventricle is much thicker than the right because it has to pump blood around the whole body. The right ventricle is thinner because it only has to pump blood through the lungs. The heart has its own blood supply from the coronary arteries.
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It is a thick ,muscular, reddish brown present in the thoracic cavity enclosing the lungs .Its function is to pump blood in the body . It is four chambered . Oxgenated blood is present in left ventricle and deoxygenated in the right ventricle. There are valve in the the heart with prevent the back flow of blood.
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