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Abstract Dorlands Illustrated Medical Dictionary defines the heart as the viscus of cardiac muscle that maintains the circulation of the blood It is divided into four cavities two atria and two ventricles The left atrium receives oxygenated blood from the lungs From there the blood passes to the left ventricle which forces it via the aorta through the arteries to supply the tissues of the body The right atrium receives the blood after it has passed through the tissues and has given up much of its oxygen The blood then passes through the right ventricle into the lungs where it gets oxygenated There are four major valves in the heart the left atrioventricular valve also known as the mitral or bicuspid valve the right atrioventricular valve tricuspid aortic valve and the pulmonary valve The heart tissue itself is nourished by the blood in the coronary arteries Position of the Heart Within the Body The heart is placed obliquely in the chest The two atria are directed upwards and backwards to the right and are at the level of the fifth through the eight dorsal vertebrae The apex of the heart points downwards and forwards to the left and corresponds to the interspace between the fifth and sixth ribs two inches below the left nipple Its atrial border corresponds to a line drawn across the sternum on a level with the upper border of the third costal cartilage Its lower border apex corresponds to a line drawn across the lower end of the same bone near the xiphoid process Its upper surface is rounded and convex directed upwards and forwards and formed mainly by the right ventricle and part of the left ventricle The posterior surface of the heart is flattened and rests upon the diaphragm muscle Of its two borders the right is the longest and thinnest the left is shorter but thicker and round
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