The human heart is the most powerful organ in the circulatory system. It works continuously like a muscular pump and keeps the blood in circulation. The heart lies in the thoracic cavity between the lungs slightly towards left, enclosed with in the rib cage with the sternum in front and vertebral column behind. It is surrounded by a double layered Pericardium. A pericardia l fluid is secreted in between the two. It functions as a lubricant and reduces friction between the heart walls and surrounding tissue during the beating of heart.
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