It is about cinque inches long, three inches wide, and two inches thick. The heart is commonly represented in the familiar Valentine shape, but it real resembles a grapefruit. The external features of the heart consist of the pericardium. The function of the pericardium is to give and protect the heart. The inside of the pericardium is delusion with a membrane that secrets a lubrication fluid which allows the pericardium to slide smoothly ov...If you want to get a full essay, order it on our website: Orderessay
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