The heart of a mammal is a complicated organ. The size of the heart varies with the animal and in man it is about the size of a clenched fist. It lies in the thorax behind the chest-bone and the two lungs.The heart is surrounded by a two-layed bag known as the pericardium, the inner membrane being in contact with the heart. Right between the two pericardial membranes is the pericardial fluid which helps to reduce friction when the heart is beating.
Generally,the heart heart weighs 0.59% of the total body mass.
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