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The Heart And Its Structure The heart is placed behind the breast bone and within the ribs (thoracic cage) with the lungs on either side. It is a hollow muscular organ made up of smooth muscles (myocardium). It is enclosed in a sac known as the preicardium (outside layer), and shaped like an egg, is about the size of a person's clenched fist and weighs around 300 g. in a man and 250 g. in a woman.The heart has four...... Similar Editorial : The EPC Class Structure by rfidtag. | Source : Coronary Artery Stenosis
